SOLUTION: for the following: 7*(2+3t)^2 I get the answer: 28 + 84t + 21t^2 what am I doing wrong??

Question 623354: for the following:
7*(2+3t)^2
I get the answer: 28 + 84t + 21t^2
what am I doing wrong??
Answer by lenny460(1073) (Show Source): You can put this solution on YOUR website!
7(2 + 3t)^2
We use the order of operations - PEMDAS - Parentheses, Exponents, Multiplication, Division, Addition and Subtraction.
(2 + 3t)^2
We Multiply the above using the FOIL Method:
(2 + 3t)(2 + 3t)
2 * 2 = 4
2 * 3t = 6t
3t * 2 = 6t
3t * 3t = 9t^2
4 + 6t + 6t + 9t^2
Combine like terms:
6t + 6t = 12t
4 + 12t + 9t^2
7(4 + 12t + 9t^2)
7 * 4 = 28
7 * 12t = 84t
7 * 9t^2 = 63t^2
The Answer:
28 + 84t + 63t^2
or to put it in the correct order:
63t^2 + 84t + 28

obuong3@aol.com
RELATED QUESTIONS
What am I doing wrong? Problem: "Subtract 7x-2 from x + 5" My equation is... (answered by MathLover1,Alan3354)

Simplify the following expression: 1/2x + 3 + 7/2x -5. The answer is 4x-2, but how... (answered by MathLover1,greenestamps)

i am trying to find the y coordinate of the vertex. the x is -2 and when i plug it in to (answered by rfer)

What am I doing wrong? -5x-2[2x-4(x+7)]-6 Here is my work down.... (answered by rwm,scott8148,MathLover1)

I have been trying to solve the following problem for 2 days: 5x-9+2x=3x+23-4x The... (answered by atique.ah,jim_thompson5910)

Use the quadratic formula to solve the following equation: 9x^2 - 12x = 4 The... (answered by Edwin McCravy)

I took my test and got a lot of answers wrong. He circled the correct answers but no... (answered by rodriguezh2)

we are working on Ellipses and i understand it, but for some reason, i am not coming up... (answered by Alan3354)

Simplify: sqrt(p^2) I get just p? what am I doing... (answered by josmiceli)