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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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โˆ™ 2012-03-29 02:11:24
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Q: Could you help me to 4x2-4x plus 1 equals 9?
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