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प्रश्न
Solve the following quadratic equation using formula method only
x2 - 7x - 5 = 0
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उत्तर
x2 - 7x - 5 = 0
a = 1 ; b = -7 ; c = -5
D = b2 - 4 ac
= (-7)2 - 4(1)(-5)
= 49 + 20
= 69
x = `(- "b" ± sqrt ("b"^2 - 4 "ac"))/(2a)`
x = `(7 +- sqrt 69)/2`
x = `(7 + sqrt 69)/2` , x = `(7 - sqrt 69)/2`
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