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SSC CGL 2020 PYQ — Question 52

SSC CGL - 7th March 2020 Shift 3 • Quantitative Aptitude • Q52

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25a2 - 9 is factored as:

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Correct answer: D

Explanation

The correct answer is option 4 i.e (5a + 3)(5a - 3)

⇒ 25a2 - 9

⇒ (5a)2 - (3)3

By applying the algebraic identity, a2 - b2 = (a + b)(a - b)

⇒ (5a + 3)(5a - 3)