(15^2–12^2)\times4=?^2

NIFT PG 2015 Question Paper with solutions

Question : 142 of 150

Marks: +1, -0

(15^2–12^2)×4=?^2

Solution:

(15^2–12^2)×4=x^2

⇒(15+12)(15–12)×4=x^2

⇒27×3×4=x^2

⇒81×4=x^2

⇒x=9×2=18.

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