X 2 + 8x -20 =0
(x + 10)(x - 2)= 0
x + 10 = 0 ............ x = -10
and
x - 2 = 0 ................. x = 2
x = -10 or 2
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It is (x+6)(x-4) when factored
x3 + 8 = x3 + 23 = (x + 2)(x2 + 2x + 22) = (x + 2)(x2 + 2x + 4)
x + 4
6x5(x2 - 6x + 3)
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)