exam Maths Puzzle Numerical Ability

can you tell me if i factored this correctly?
64x^2-1
=x(2+8)

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exam Other Question

find the product
(9x-8)^2

a)81x^2+64
b)9x^2+64
c)9x^2-144x+64
d)81x^2-144x+64 Multiply:
((x^2+x-12)/(x^2-x-20))X((x^2+2x-35)/(x^2+9x+14))