If the square of a-2ab-8b = 0 (AB is not equal to 0), then a of B is equal to?

A:
a²-2ab-8b²=0
Divide the two sides by B & #
(a/b)²-2a/b-8=0
So:
(a/b-4)(a/b+2)=0
So: A / b = 4 or a / b = - 2

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