Which values make this equation true? (5x^7 y^2)(-4x^4 y^5)=-20x^a y^b A.) a=11, b=7 B.) a=11, b=10 C.) a=28, b=7 D.) a=28, b=10

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asked Feb 7, 2019 28.0k views

1 Answer

Danuofr · Answer 1 · 2019-02-11T10:42:00+0000

When multiplying terms with exponents, just add the exponents together.

You have x^7 and x^4, so 7 +4 = 11

Y^2 and Y^5 = 2+5 = 7

so it would be -20x^11 y^7

The answer is A.) a=11, b=7