Book Maths Puzzle Algebra

Can you factorise 16-9y2 , x2+7x+12 , x3-x , 16-14t-2t2 , x4-2x2-8

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Book Other Question

A large concrete block of (x^4-y^4) cubic feet is divided into smaller equal-sized blocks of (x-y)^2 cubic feet each. Using only these smaller blocks, whose size can also be expres how do we do to solve 2q^2+14q=2q-q^2-9 ?