SOLUTION: Need help evaluating each expression for a= -4 and b= 5 1. (3a)^2 answer= 24? 7. -ab^2(a-ab) 10. -b -a^2- 8 15. -(ab)3 answer=60? Thank you for any help gi

Algebra ->  Expressions -> SOLUTION: Need help evaluating each expression for a= -4 and b= 5 1. (3a)^2 answer= 24? 7. -ab^2(a-ab) 10. -b -a^2- 8 15. -(ab)3 answer=60? Thank you for any help gi      Log On


   

Question 171374: Need help evaluating each expression for a= -4 and b= 5

1. (3a)^2
answer= 24?
7. -ab^2(a-ab)

10. -b -a^2- 8
15. -(ab)3
answer=60?
Thank you for any help given! :)
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Need help evaluating each expression for a= -4 and b= 5
1. (3a)^2
answer= 24?
(3a)^2 = (3*(-4))^2
= (-12)^2
=144
-------------
7. -ab^2(a-ab)
= -(-4)*5^2*(-4 - (-4)*5)
= 4*25*(-4 + 20)
= 100*(16)
=1600
--------------
10. -b -a^2- 8
= -5 -(-4)^2 -8
= -5 -16 -8
= -29
-------------
15. -(ab)3
= -(-4*5)*3 (assume you mean times 3)
= 60
answer=60?
----------------