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Question

If x = 30% of 30, then x2+4x+7= _____.



Your Answer
A

142

Your Answer
B

134

Your Answer
C

143

Correct Answer
D

124


Solution

The correct option is D

124


x=30% of 30 = 30100×30                              
                               = 900100                                    
                               = 9

Substituting for x = 9 we get,
x2+4x+7=(9)2+4(9)+7                      
                      = 81 + 36 + 7                      
                      = 124

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