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Algebraic Expressions

Which of the ...

Question

Which of the following expressions has a error in it ?

4 x^{2} + 5 x = x (4 x + 5)

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6 x + 2 y = 2 (3 x + y)

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5 x - 20 = 5 (x - 20)

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6 x^{2} + 9 = 3 (2 x^{2} + 3)

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Solution

The correct option is A $5 x - 20 = 5 (x - 20)$
$5 x - 20 = (5 \times x) - (5 \times 4)$
$= 5 (x - 4)$

$∴ 5 (x - 20) = 5 (x - 20)$ is an incorrect statement.

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