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x2 - 4x - 21 = (x-7)(x+3)
4x2 - x - 3 = 0 (x - 1)(4x + 3) = 0 So x - 1 = 0 or 4x + 3 = 0 ie x = 1 or = -3/4 = -0.75
4x + 20
x(4x-2)
x2-4x-165 = (x-15)(x+11) when factored