exam Maths Puzzle Numerical Ability

Factor each expression.

a^2(b-c)-16b^2(b-c)

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exam Other Question

Solve.

w^4-12w^2-2=0

I did a similar problem and was supposed to come up with 4 different radicals and I only came up with 2 for my answer and was told it was wrong.
I need help with these type of equations please,
-9h=-3(-3)