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Question

The square of (5x + 1) is equal to 16. What isx ?



Your Answer
A

x= -1,4/5

Your Answer
B

x = 1,3/2

Correct Answer
C

x = -1,3/5

Your Answer
D

x= 5, 1/4


Solution

The correct option is C

x = -1,3/5


Converting statement into an equation-

(5x+1)2 =16 (Applying (a+b)2 formula)

5x + 1 = ± 4(Taking square root on both sides)

5x = -5,3

x=1,35

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