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प्रश्न
Solve the equation 5x2 – 3x – 4 = 0 and give your answer correct to 3 significant figures:
उत्तर
We have 5x2 – 3x – 4 = 0
Here a = 5, b = – 3, c = – 4
x = `(-b ± sqrt(b^2 - 4ac))/(2a)`
= `(3 ± sqrt(9 + 4 xx 5 xx 4))/(2 xx 5)`
= `(3 ± sqrt(89))/(10)`
`x = (3 + 9.43)/(10) or x = (3 - 9.43)/(10)`
⇒ `x = (12.43)/(10) or x = (-6.43)/(10)`
⇒ x = 1.24 or x = -0.643.
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