Question

Simplify: (2x + 5)2 – (2x – 5)2​

Answer 1

Step-by-step explanation:

${(2x + 5)}^{2} - {(2x - 5)}^{2}$

using

${a}^{2} - {b}^{2} = (a + b)(a - b)$

$= (2x + 5 + 2x - 5)(2x + 5 - 2x + 5)$

$= 4x \times 10$

$= 40x$

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