exam Maths Puzzle Numerical Ability

what is

p to the second minus 10pq plus 16q to the second?
so far i got....(p+16q)(p+q)

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exam Other Question

factor:

40x^4y + 52x^3y^2 - 12x^2y^3
Given f(x)=2x+2, find f(-1)

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