exam Maths Puzzle Numerical Ability

solve for a:

16a^4 - 9a^2 = 0

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exam Other Question

Explain why the rules of multiplication hold:

-(-) = +
+(+)=+
-(+)=-
+(-)=- How do you solve this rational expression?
(5X^3)(16X^2)/80X^3.
I have tried doing it on my own, but my teacher did not explain how to do it...