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Probably a quadratic equation problem.
4X2 - 4X + 1 = 9
4X2 - 4X - 8 = 0
factor out a 4 looks like a dead end, so....
X = - b (+/-) sqrt(b2 - 4ac)/2a
a = 4
b = - 4
c = - 8
X = - (- 4) (+/-) sqrt[(- 4)2 -4(4)(- 8)]/2(4)
X = 4 (+/-) sqrt(16 + 128)/8
X = 4 (+/-) sqrt(144)/8
X = [4 (+/-) 12]/8
================
X = 2
X = - 1
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∙ 12y ago
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