If x = 30% of 30, then $x^{2} + 4 x + 7 =$ _____.

142

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134

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143

No worries! We‘ve got your back. Try BYJU‘S free classes today!

124

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Solution

The correct option is D
124

$x = 30 % o f 30$ = $\frac{30}{100} \times 30$
= $\frac{900}{100}$
= 9

Substituting for x = 9 we get,
$x^{2} + 4 x + 7 = (9)^{2} + 4 (9) + 7$
= 81 + 36 + 7
= 124

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