HEIII DRAGI COPII!!! EX 4 VA ROOOG
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a)x(x^2 - y^2) = x(x-y)(x+y)
b)ax^2 + 2ax + a - ax^2 + 2ax - a = 4ax
c)x^4 + 14x^2 + 49 - 16x^2 - 112 = x^4 - 2x^2 - 63 = (x^2 + 7)(x^2 - 9) = (x^2 + 7)(x-3)(x+3)
d)(x^2 + x + 1 - 1)(x^2 + x + 1 + 1) = (x^2 + x)(x^2 + x + 2) = x(x+1)(x^2 + x + 2)