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प्रश्न
Solve the quadratic equation 2x2 + 5x + 2= 0 using formula method.
उत्तर
2x2 + 5x + 2= 0 .
Comparing the given equation with ax2 + bx +cx = 0.
a = 2, b = 5, c = 2.
b2 - 4ac = 52 - 4 (2)(2)
= 25 - 16
= 9
By Formula Method
x = `(-b +- sqrt(b^2 -4ac))/(2a)`
`x = (-5 +-sqrt(9))/(2(2))`
`=(-5+-3)/4`
`x =(-5+3)/4 " or " x = (-5-3)/4`
`x = (-2)/4 " or " x = (-8)/4`
∴ `x =(-1)/2 ` x = - 2
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