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Anonymous
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x2+14x+40 = (x+4)(x+10) when factored
x^2 + 14x + 40 factorises as (x + 10)(x + 4) so the roots are x = -10, -4.
x2 + 14x + 48 = (x + 8)(x + 6)
x2 - 14x + 45 = (x - 9)(x - 5)
x=7