What is the output of $x^{2} + 3 x + 5$ , where $x$ (variable) = $2$ ?

11

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12

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13

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15

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Solution

The correct option is D $15$
$x^{2} + 3 x + 5$
$= (2)^{2} + 3 \times 2 + 5$
$= 4 + 6 + 5$
$= 15$

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Prove that:
(i) $\frac{1}{3 + \sqrt{7}} + \frac{1}{\sqrt{7} + \sqrt{5}} + \frac{1}{\sqrt{5} + \sqrt{3}} + \frac{1}{\sqrt{3} + 1} = 1$
(ii) $\frac{1}{1 + \sqrt{2}} + \frac{1}{\sqrt{2} + \sqrt{3}} + \frac{1}{\sqrt{3} + \sqrt{4}} + \frac{1}{\sqrt{4} + \sqrt{5}} + \frac{1}{\sqrt{5} + \sqrt{6}} + \frac{1}{\sqrt{6} + \sqrt{7}} + \frac{1}{\sqrt{7} + \sqrt{8}} + \frac{1}{\sqrt{8} + \sqrt{9}} = 2$

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What is the output of x2+3x+5, where x(variable) = 2?

The correct option is D 15x2+3x+5=(2)2+3×2+5=4+6+5=15

What is the output of $x^{2} + 3 x + 5$ , where $x$ (variable) = $2$ ?

The correct option is D $15$
$x^{2} + 3 x + 5$
$= (2)^{2} + 3 \times 2 + 5$
$= 4 + 6 + 5$
$= 15$