exam Maths Puzzle Numerical Ability

find the product
(9x-8)^2

a)81x^2+64
b)9x^2+64
c)9x^2-144x+64
d)81x^2-144x+64

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exam Other Question

x + y + 2 = 0
x y - 8
can you tell me if i factored this correctly?
64x^2-1
=x(2+8)