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# if a=5 and b=-2,what is the value of 3a+ab3rd power/4(a-2b)?

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- rajLv 71 decade agoFavorite Answer
3a=3*5=15

ab^3=5(-2)^3

=-40

4(a-2b)

=4(5+4)

=36

ab^3/4(a-2b)=-40/36

=-10/9

thexpression=15-10/9

=13 8/9

- ♪♥Annie♥♪Lv 61 decade ago
[3a + ab^3] / [4(a - 2b)]

They give us the values for a = 5 and b = -2 > take the values and replace them with the appropriate variable:

= [3(5) + 5(-2)^3] / [4(5 - 2(-2)]

First: solve according to order of operations:

PEMDAS > ( ), exponents, multiplication, division, addition, subtraction

= [15 + 5(-8)] / [4(5 + 4)]

= [15 - 40] / 4(9)

= -25/36

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