Substitute $x = 3$ and find the value of the given expression
$x^{2} + 5 x$

23

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17

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19

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24

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Solution

The correct option is D $24$
Given, $x = 3$
Putting the value of $x$ , we get,
$x^{2} + 5 x$
$= (3)^{2} + 5 (3)$
$= 9 + 15$
$= 24$

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x

Find and correct the errors in the following mathematical statement. Substituting x = −3 in

(a) x² + 5x + 4 gives (−3)² + 5 (−3) + 4 = 9 + 2 + 4 = 15

(b) x² − 5x + 4 gives (−3)² − 5 (−3) + 4 = 9 − 15 + 4 = −2

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