Roots of quadratic equation $7 x^{2} + 4 x - 20 = 0$ are

- 2, \frac{10}{7}

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2, \frac{10}{7}

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- 2, \frac{- 10}{7}

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2, \frac{- 10}{7}

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Solution

The correct option is D $- 2, \frac{10}{7}$
Given equation is:
$7 x^{2} + 4 x - 20 = 0$
$7 x^{2} + 14 x - 10 x - 20 = 0$
$(7 x - 10) (x + 2) = 0$
$∴ x = \frac{10}{7}, - 2$
$∴$ roots of the given equation are $- 2, \frac{10}{7}$

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