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Anonymous
X2 - 4X - 5 = 0
easy factor, what two factors of - 5 add up to - 4
(X + 1)(X - 5)
X = - 1
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X = 5
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Wiki User
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Yes and x = 2+square root of 6 or x = 2-square root of 6
4x + 20
7
x2 - 4x - 21 = (x-7)(x+3)
13