exam Maths Puzzle Numerical Ability

factor all polynomials completely
6d2+33d-63
1-8m6
4a2-4ab-y2+b2
16y4-z4

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exam Other Question

What are the steps needed to simplify this equation?
square root of 49x^2z^6

(^ is raised to; to the power of)
-x2-5x-6x, x=-3 and x=-2