Exams › SSC CGL (Prelims) › Maths

The area of a square is $16x^2 + 40x + 25$ square units. Find the perimeter of the square.

1. 3(10x+8)
2. 3(8x+10)
3. 2(10x+8)
4. 2(8x+10)

Correct answer: 2(8x+10)

Solution

The area $16x^2 + 40x + 25$ can be written as $(4x+5)^2$. So the side of the square is $4x+5$, and the perimeter is $4(4x+5)=16x+20=2(8x+10)$.

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