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Question

Simplify: $$(2x + 5)^2 -(2x-5)^2$$


A
10x
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B
4x
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C
59x
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D
40x
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Solution

The correct option is D $$40x$$
   $$ (2x+5)^2-(2x-5)^2$$
$$=4x^2 + 20x +25 - (4x^2 - 20x + 25)$$
$$=4x^2 + 20x + 25 - 4x^2 + 20x - 25$$
$$=40x$$

Mathematics

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