Question

Simplify the following expressions and evaluate them as directed:

5xy(3x + 4y - 7) – 3y(xy – x2 + 9) - 8 for x = 2, y = -1
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Answer 1

Answer:

5(2)(-1)(3*2+4(-1)-7)-3(-1)(2(-1)-2*2+9)-8

=-10(6-4-7)+3(-2-4+9)+8

=-10(-5)+3(3)-8

=50+9-8

=51

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Answer 2

Answer:

x=2, y=-1

5(2)(-1){3(2)+4(-1)-7}-3(-1){(2)(-1)-(2)²+9}-8

-10(6-4-7)+3(-2-4+9)-8

-60+40+70-6-12+27-8

-80+137

57 ans.

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