SOLUTION: 37. Solve by using the quadratic formula. x2 – 8x – 9 = 0

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Question 46254: 37. Solve by using the quadratic formula. x2 – 8x – 9 = 0
Answer by venugopalramana(3286) About Me  (Show Source):
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Solve by using the quadratic formula. x2 – 8x – 9 = 0
AX^2+BX+C=0 IS THE STD.EQN..A=1,B=-8,C=-9
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-8%29+%2B-+sqrt%28+%28-8%29%5E2-4%2A1%2A%28-9%29+%29%29%2F%282%2A1%29+
x+=+%288+%2B-+sqrt%28+64%2B36+%29%29%2F%282%29+
x+=+%288+%2B-+10%29%2F%282%29+
X=9 OR -1