X is defined as 30 - of 30 - If y - x 2-4 x -7- find the value of yA- 124B- 142C- 134D- 143

The correct option is A 124 30% of 30 = 30/100× 30 = 9 Putting x = 9 in the equation of y y = x^2 + 4x + 7 y = 9^2 + 4(9) + 7 y = 81 + 36 + 7 y = 124 ...

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Standard VIII

Mathematics

Percentages

x is defined ...

Question

$x$ is defined as $30 %$ of $30$ . If $y = x^{2} + 4 x + 7$ , find the value of y.

142

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134

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143

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124

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Solution

The correct option is A 124
$30 % o f 30 = \frac{30}{100} \times 30 = 9$
Putting $x = 9$ in the equation of $y$
$y = x^{2} + 4 x + 7$
$y = 9^{2} + 4 (9) + 7$
$y = 81 + 36 + 7$
$y = 124$

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x is defined as 30% of 30. If y=x2+4x+7, find the value of y.

The correct option is A 12430% of 30=30100×30=9 Putting x=9 in the equation of y y=x2+4x+7 y=92+4(9)+7 y=81+36+7 y=124

$x$ is defined as $30 %$ of $30$ . If $y = x^{2} + 4 x + 7$ , find the value of y.

The correct option is A 124
$30 % o f 30 = \frac{30}{100} \times 30 = 9$
Putting $x = 9$ in the equation of $y$
$y = x^{2} + 4 x + 7$
$y = 9^{2} + 4 (9) + 7$
$y = 81 + 36 + 7$
$y = 124$