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Polynomial Expressions

Question 7x =...

Question

Question 7
$x = \frac{4}{5} (x + 10)$

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Solution

$x = \frac{4}{5} (x + 10)$
$\Rightarrow 5 x = 4 (x + 10)$
$\Rightarrow 5 x = 4 x + 40$
$\Rightarrow 5 x - 4 x = 40$
$\Rightarrow x = 40$
To check:
$x = \frac{4}{5} (x + 10) \Rightarrow 40 = \frac{4}{5} (40 + 10)$
$\Rightarrow 40 = \frac{4}{5} \times 50 \Rightarrow 40 = 4 \times 10$
$\Rightarrow 40 = 40$
$\Rightarrow L . H . S = R . H . S$ .
Hence, it is correct.

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Polynomial Expressions

Standard IX Mathematics

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