# How to add and subtract rational expressions? 8/x-4 2x/4 y - 1

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Hi ihave a bosch dishwaser that has been stood for a while its working going through the programs ok but its not washing pots properly any ideas please

Posted on Aug 29, 2010

Hi,
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Posted on Jan 02, 2017

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## Related Questions:

### What is factoring and give the examples

Quick-Start Guide When you enter an expression into the calculator, the calculator will simplify the expression by expanding multiplication and combining like terms. At this point the calculator will attempt to factor the expression by dividing a G C F, and identifying a difference between two squares, or factorable trinomials. Use the following rules to enter expressions into the calculator. Variables Any lowercase letter may be used as a variable. Exponents Exponents are supported on variables using the ^ (caret) symbol. For example, to express x 2, enter x ^ 2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not currently be placed on numbers, brackets, or parentheses. Parentheses and Brackets Parentheses ( ) and brackets [ ] may be used to group terms as in a standard expression. Multiplication, Addition, and Subtraction For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is optional when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * ( x + 5 ) can also be entered as 2 ( x + 5 ) ; 2 x * ( 5 ) can be entered as 2 x ( 5 ). The * is also optional when multiplying parentheses, example: ( x + 1 ) ( x - 1 ). Order of Operations The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not currently supported; attempts to use the / symbol will result in an error. Division, Square Root, Radi cals, Fractions Division, square root, radi cals, and fractions are not supported at this time. A future release will add this functionality.

that's all I can say basically I learned it this way.

Jul 09, 2015 | Office Equipment & Supplies

### Can i add and subtract polynomials in this app or using numbers?

You can as long as the variables are the same. i.e. 2h + -7h is OK. 2h + -7k is not OK since the variables (letters) are not the same.

Nov 02, 2014 | Springer Polynomial and Rational Matrices

### How do I tell wether a number is rational or irrational?

If a number can be expressed as a ratio of two whole numbers then it's rational.
Alternatively, if a number can be expressed in decimal with a finite number of digits or as a repeating decimal then it's rational.

Oct 12, 2014 | Computers & Internet

### Luke wants to find the difference 175 - 134. He has subtracted the hundreds and tens so far. What is the sum of the two numbers he has subtracted? How much does he still need to subtract?

SUM means adding not subtracting. so if you were wanting to add the total (the sum) of the amounts of the hundreds and the tens would be 170 plus 130 which would be 300 but the remainder from subtracting 130 from 170 would be 40. That would leave the single units 5 minus 4 of which the remainder is 1. So, the remainder from subtracting 134 from 175 is the reminder of subtracting the one hundred from the one hundred which is zero added to the remainder of subtracting the tens (70 minus 30) which is the remainder of 40 plus the remainder of subtracting the units of 5 minus 4 which is 1. So you need to add the 0 and the 40 and 1 which is the remaining sum of 41.

Sep 19, 2014 | Office Equipment & Supplies

### I thought the answer should be 3

I assume you mean (2x12)/4+10-6 as in your first post. I can understand how you got the wrong answer of 3 in that case but not as you wrote it here.

Multiplication and division get precedence over addition and subtraction.

First, evaluate the expression inside the parentheses: 2x12 is 24.
Then divide by 4 to get 6.
Subtract 6 to get 10.

If you incorrectly do addition and subtraction before division then you divide 24 by 4+10-6 (which is 8) and get 3.

Jan 14, 2014 | Computers & Internet

### Do two integers equal a rational number

Yes, all integers are rational numbers. Adding, subtracting, multiplying and dividing any 2 integers results in a rational number.

Nov 19, 2013 | Computers & Internet

### Is 8/3 a rational number

A rational number is a number that can be expressed as the RATIO (see rational) of two integer (whole) numbers. 8 is an integer, and so is 3. The number 8/3 is a RATIO of two integers :it fits the definition of a rational number.

Oct 29, 2013 | Mathsoft Computers & Internet

### `What constitutes a rational expression? How would you explain this concept to someone unfamiliar with it?

A rational expression is a ratio of two polynomial expressions.
Example R(x)=P(x)/Q(x) where P(x) and Q(x) are polynomials of the indeterminate x.

Sep 27, 2012 | Mathsoft StudyWorks! Mathematics Deluxe...

### Can this calculator find the sum of two rational expressions??

All calculators can calculate the sum of two numerical expressions (no letter symbols).
To be able to declare that this calculator can add two rational expressions ( with letter symbols or not) and displays them as a rational expression (result) I would need to know the EXACT Model.

Aug 15, 2011 | Casio Office Equipment & Supplies

### Give some example of math equation?

The following are examples of expressions:
2
x
3 + 7
2 × y + 5
2 + 6 × (4 - 2)
z + 3 × (8 - z)
Example:
Roland weighs 70 kilograms, and Mark weighs k kilograms. Write an expression for their combined weight. The combined weight in kilograms of these two people is the sum of their weights, which is 70 + k.
Example:
A car travels down the freeway at 55 kilometers per hour. Write an expression for the distance the car will have traveled after h hours. Distance equals rate times time, so the distance traveled is equal to 55 × h..
Example:
There are 2000 liters of water in a swimming pool. Water is filling the pool at the rate of 100 liters per minute. Write an expression for the amount of water, in liters, in the swimming pool after m minutes. The amount of water added to the pool after m minutes will be 100 liters per minute times m, or 100 × m. Since we started with 2000 liters of water in the pool, we add this to the amount of water added to the pool to get the expression 100 × m + 2000.
To evaluate an expression at some number means we replace a variable in an expression with the number, and simplify the expression.
Example:
Evaluate the expression 4 × z + 12 when z = 15.
We replace each occurrence of z with the number 15, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.
4 × z + 12 becomes
4 × 15 + 12 =
60 + 12 =
72
Example:
Evaluate the expression (1 + z) × 2 + 12 ÷ 3 - z when z = 4.
We replace each occurrence of z with the number 4, and simplify using the usual rules: parentheses first, then exponents, multiplication and division, then addition and subtraction.
(1 + z) × 2 + 12 ÷ 3 - z becomes
(1 + 4) × 2 + 12 ÷ 3 - 4 =
5 × 2 + 12 ÷ 3 - 4 =
10 + 4 - 4 =
10.

Jun 22, 2011 | LeapFrog Turbo Twist Math Cartridge 5th...

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