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Question
Solve the following quadratic equation using formula method only :
x2 +10x- 8= 0
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Solution
x2 +10x- 8= 0
a = 1 ; b = 10 , c = - 8
D = b2 - 4ac
= (10)2 - 4(1)(-8)
= 100 + 32
= 132
x = `(- "b" ± sqrt ("b"^2 - 4 "ac"))/(2a)`
x = `(- 10 ± sqrt 132)/2`
x = `-10/2 ± sqrt (132/4)`
x = `- 5 + sqrt 33 , x = -5 - sqrt 33`
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