Substituting x -3 in x 2-5 x gives 32-5-3-9-15-24A- TrueB- False

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Byju's Answer

Standard IX

Mathematics

Evaluating Area When Side Is a Variable

Substituting ...

Question

Substituting $x = - 3$ in $x^{2} + 5 x$ gives $3^{2} + 5 (- 3) = - 9 - 15 = - 24.$

True

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False

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Solution

The correct option is B
False

Substituting x= -3 in $x^{2} + 5 x$ gives $(- 3)^{2} + 5 (- 3) + 4 = 9 - 15 = - 6$

Here $(- 3)^{2} = 9$ , not $- 9$ .

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Similar questions

Q. Find and correct error in the following mathematical statement.
Substituting

x = - 3

in:
(a)

x^{2} + 5 x + 4

gives

(- 3)^{2} + 5 (- 3) + 4 = 9 + 2 + 4 = 15

(b)

x^{2} - 5 x + 4

gives

(- 3)^{2} - 5 (- 3) + 4 = 9 - 15 + 4 = - 2

(c)

x^{2} + 5 x

gives

(- 3)^{2} + 5 (- 3) = - 9 - 15 = - 24

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

Question 10(iii)
Find and correct the errors in the following mathematical statement. Substituting $x = - 3$ in
$x^{2} + 5 x g i v e s (- 3)^{2} + 5 (- 3) = - 9 - 15 = - 24$

The value of the expression $x^{2} - 5 x + 4 w h e n x = - 3$ is,
$(- 3)^{2} - 5 \times - 3 + 4 = 9 + 15 + 4 = 28$

Find and correct the errors in the following mathematical statement, Substituting $x = - 3$ in
$x^{2} + 5 x + 4$ gives $(- 3)^{2} + 5 (- 3) + 4 = 9 + 2 + 4 = 15$

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Substituting x=−3 in x2+5x gives 32+5(−3)=−9−15=−24.

The correct option is B False Substituting x= -3 in x2+5x gives (−3)2+5(−3)+4=9−15=−6 Here (−3)2=9, not −9.

Substituting $x = - 3$ in $x^{2} + 5 x$ gives $3^{2} + 5 (- 3) = - 9 - 15 = - 24.$

The correct option is B
False

Substituting x= -3 in $x^{2} + 5 x$ gives $(- 3)^{2} + 5 (- 3) + 4 = 9 - 15 = - 6$

Here $(- 3)^{2} = 9$ , not $- 9$ .