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Posted on Jan 02, 2017
SOURCE: Factoring polynomials "Algebra"
choose equation format "4"
input the coefficient for a which is "1" and hit "="
input the coefficient for b which is "4" and hit "="
input the coefficient for c which is "3" and hit "="
input the coefficient for d which is "12" and hit "="
Hit "=" for X1
Hit "=" again for X2
Hit "=" again for X3
Posted on Oct 20, 2008
SOURCE: Solving matrix
Go to your matrix button and enter a "3x4" matrix.
Then enter it as follows:
-3 4 5 7
4 3 2 9
-5 5 3 -10
Then exit out and go to "2nd->matrix->math->rref(". Then press enter.
Your screen should look like this:
Then go to matrix and select your 3x4 matrix, press enter and close it with a parathesis. Your screen should look like this:
Press enter and the screen should say this:
1 0 0 2
0 1 0 -3
0 0 1 5
Hope this cleared up the confusion!
Posted on Mar 14, 2009
SOURCE: 4x+3y=6 how do you solve for y
I am not lecturing you but I would rather you understand how to do the manipulations involved in isolating a variable.
You want to isolate y, Ok
Start stripping it of all that is not y.
3y + 4x =6. (Addition is commutative, I can change the order of addition)
The term with y is added to 4x. If I want the term in y alone on one side I perform the inverse operation of addition, a substraction. I subtract 4x from both sides.
3y+4x-4x=6-4x. But 4x-4x=0, and we are left with
3y= - 4x+6
This operation is sometimes summarized as make one term change side while changing its sign
It would do no harm to put the right side of the foregoing equation in parentheses. I do that to avoid errors)
Now y is multiplied by the number 3. To isolate y I have to perform the inverse operation of the multiplication, namely the division by 3
3y/3 =(-4x+6)/3. The left hand side is just y
While result is correct, I can also open the parentheses
y= -4x/3 +6/3
y= -(4/3)*x +2.
Hope it helps.
Posted on Oct 30, 2009
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