Find the value of x if $x^{2} + 7 x - 2 x^{2} - 2 x$ .

x = 0

5

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x = 0

- 5

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x = 0

9

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x = 0

- 9

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Solution

The correct option is A $x = 0$ , $5$
$x^{2} + 7 x - 2 x^{2} - 2 x = 0$
$\Rightarrow$ $- x^{2} + 5 x = 0$
$\Rightarrow$ $- (x^{2} - 5 x) = 0$
$\Rightarrow$ $x^{2} - 5 x = 0$
$\Rightarrow$ $x (x - 5) = 0$
$\Rightarrow$ $x = 0$ and $x - 5 = 0$
$∴$ $x = 0$ and $x = 5$

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