# 20 Most Recent Texas Instruments TI-86 Calculator Questions & Answers

### Error 07

Error 07 is Syntax Error. From the manual: "You entered a value; look for misplaced functions, arguments, parentheses, or commas; check the syntax description in the A to Z reference."

If you can't find and fix the error, could you post the expression producing the error?
12/7/2020 11:38:55 AM • Texas... • Answered on Dec 07, 2020

### My TI-86 screen had white

There is no solution for old age. Get a newer calculator.
5/28/2018 3:05:29 AM • Texas... • Answered on May 28, 2018

### HOW TO FIND CUBE ROOT

There is a way to do it. I believe you go into "complex" or "math" buttons. These buttons are yellow on the calculator. Therefore, to access them you must hit "2nd" then the button.

Better yet, you can also get around this dilemma another way. You can enter "the cubed root of x" by raising x to 1/3.

For example the cubed root of x = x^(1/3). It is best to place parentheses around 1/3 so the calculator knows exactly what you mean.

Another example, the "cubed root of (x + 1)" can be entered by:
(x+1)^(1/3) Note the parenteses around both (x+1) and (1/3). This applies if the radical cover both "x" and "1".

Hope this helps.
2/7/2018 8:32:26 AM • Texas... • Answered on Feb 07, 2018

### I have a TI-86, whenever i input - it shows Ans- and then it show that is an error. how can i fix it.

The - key is for subtraction, an operation that needs two numbers. If you press - as the first key on a line, the calculator assumes you want to subtract something from the previous answer, Ans. If you want to enter a negative number, use the (-) key on the bottom row of the keyboard, just to the left of the Enter key.
8/18/2016 12:22:50 AM • Texas... • Answered on Aug 18, 2016

### Graphing x=f(y)

See images below
5/3/2016 6:00:30 PM • Texas... • Answered on May 03, 2016

### How do I find the cube root button on my TI- 86

Hello,
There is a relation between roots and fractionary powers.

2nd root (square root) of X = X^(1/2) power 1/2
3rd root (cubic root) of X = X^(1/3) power 1/3
4th root of X = X^(1/4)
...
n-th root of X = X^(1/n)

Use the raise to arbitrary power key labeled as a caret [^] or [X to the y] or [Y to the x]
Hope it helps.

12/13/2015 2:04:31 AM • Texas... • Answered on Dec 13, 2015

### I'm trying to graph and get error 07

See cap image below
5/27/2015 8:39:29 PM • Texas... • Answered on May 27, 2015

### Reduce the fraction 83/360

83/360 is already reduced to lowest terms since 83 and 360 have no factors in common (other than 1).
11/7/2014 5:36:22 PM • Texas... • Answered on Nov 07, 2014

### How do I convert fractions to decimals on a TI-86 calculator?

Just divide the numerator by the denominator. For example, to convert 1/4 to decimal, press 1 / 4 ENTER and see .25
9/15/2014 9:30:15 PM • Texas... • Answered on Sep 15, 2014

### How do I reset my TI-86 after a long period of no use.

Every time you change batteries this will happen to you. First press 2nd then press and hold the down arrow. Hold until their is no black in the background but you can still see the numbers on the screen.
9/5/2014 5:10:53 PM • Texas... • Answered on Sep 05, 2014

### I am unable to graph a simple equation (y=-1.5x+3) on my TI-86 without getting error 07 message. How do I fix it?

Read on how to set up calculator for graphing. And check your input.
9/2/2014 3:24:09 AM • Texas... • Answered on Sep 02, 2014

### Where is the insert variable key on my graphing calculator

You can type in an x-variable by pressing the x-var key. For other graph types, the variables r, theta, t, can be enter by pressing the appropriate function key. from the graph equation entry screen.
8/28/2014 11:21:20 PM • Texas... • Answered on Aug 28, 2014

### When I try to enter a simple equation and graph it, I get error 07 message instead of graph.

Error 07 Syntax Means you made a typing error while entering the equation. Using the minus sign instead of the negation sign (change sign) (-), can produce a syntax error. Maybe you need to explicitly type the multiplication sign y= (-) 1.5*x +3 Try entering it as 3 - 1.5*x
8/28/2014 10:48:31 PM • Texas... • Answered on Aug 28, 2014

### How do I graph a simple equation, without getting an error 07 message? y=-1.5x+3

Error 07 Syntax Means you made a typing error while entering the equation. Using the minus sign instead of the negation sign (change sign) (-), can produce a syntax error. Maybe you need to explicitly type the multiplication sign y= (-) 1.5*x +3 Try entering it as 3 - 1.5*x
8/28/2014 10:40:49 PM • Texas... • Answered on Aug 28, 2014

### How do I graph a simple equation on my TI-86, without getting an error 07 message? y=-1.5x+3

Error 07 Syntax Means you made a typing error while entering the equation. Using the minus sign instead of the negation sign (change sign) (-), can produce a syntax error. Maybe you need to explicitly type the multiplication sign y= (-) 1.5*x +3 Try entering it as 3 - 1.5*x
8/28/2014 10:40:18 PM • Texas... • Answered on Aug 28, 2014

### 17/4 as a percent

425%
6/20/2014 5:09:20 PM • Texas... • Answered on Jun 20, 2014

### I need to estimate car

Hello Sir/Ma
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6/12/2014 3:06:49 PM • Texas... • Answered on Jun 12, 2014

### What is the reduced fraction form of 180%

1 4/5 or 9/5
6/12/2014 3:05:23 PM • Texas... • Answered on Jun 12, 2014

### Cube root of 91.053

Press 3 2nd MATH F5 MORE F4 9 1 . 0 5 3 ENTER or press 9 1 . 0 5 3 ^ ( 1 / 3 ENTER
6/12/2014 4:19:55 AM • Texas... • Answered on Jun 12, 2014

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