ABC26GN1345 · Square Roots and Cube Roots

Subject: General Aptitude · Chapter: Square Roots and Cube Roots · Exam: · Marks: · Difficulty:

The square root of $\left(272^{2}-128^{2}\right)$ is
(a)144
(b)200
(c)240
(d)256
Answer
Answer (as printed): C
Explanation
$$\begin{aligned} \sqrt{(272)^{2}-(128)^{2}} & =\sqrt{(272+128)(272-128)} \\ & =\sqrt{400 \times 144}=\sqrt{57600}=240 . \end{aligned}$$

Explanation as extracted from the printed page; notation may be imperfect.

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