Question 171374
Need help evaluating each expression for a= -4 and b= 5 
1. (3a)^2 
answer= 24? 
(3a)^2 = (3*(-4))^2
= (-12)^2
=144
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7. -ab^2(a-ab) 
= -(-4)*5^2*(-4 - (-4)*5)
= 4*25*(-4 + 20)
= 100*(16)
=1600
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10. -b -a^2- 8
= -5 -(-4)^2 -8
= -5 -16 -8
= -29
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15. -(ab)3 
= -(-4*5)*3  (assume you mean times 3)
= 60
answer=60? 
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