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

(c) x² + 5x gives (−3)² + 5 (−3) = −9 − 15 = −24

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Solution

(a) For x = −3,

x² + 5x + 4 = (−3)² + 5 (−3) + 4 = 9 − 15 + 4 = 13 − 15 = −2

(b) For x = −3,

x² − 5x + 4 = (−3)² − 5 (−3) + 4 = 9 + 15 + 4 = 28

(c) For x = −3,

x² + 5x = (−3)² + 5(−3) = 9 − 15 = −6

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

Question 10(ii)
Find and correct the errors in the following mathematical statement. Substituting $x = - 3$ in
$x^{2} - 5 x + 4 g i v e s (- 3)^{2} - 5 (- 3) = 9 - 15 + 4 = - 2$

The value of following expression when x = 3, $x^{2}$ − 5x + 4 gives $(- 3)^{2}$ − 5 (−3) + 4 = 9 + 15 + 4 = 28

The value of following expression when $x = - 3$ ,

$x^{2}$ − 5x + 4 gives $(- 3)^{2}$ − 5 (−3) + 4 = 9 + 15 + 4 = 28

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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 (c) x2 + 5x gives (−3)2 + 5 (−3) = −9 − 15 = −24

(a) For x = −3, x2 + 5x + 4 = (−3)2 + 5 (−3) + 4 = 9 − 15 + 4 = 13 − 15 = −2 (b) For x = −3, x2 − 5x + 4 = (−3)2 − 5 (−3) + 4 = 9 + 15 + 4 = 28 (c) For x = −3, x2 + 5x = (−3)2 + 5(−3) = 9 − 15 = −6

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

(c) x² + 5x gives (−3)² + 5 (−3) = −9 − 15 = −24

(a) For x = −3,

x² + 5x + 4 = (−3)² + 5 (−3) + 4 = 9 − 15 + 4 = 13 − 15 = −2

(b) For x = −3,

x² − 5x + 4 = (−3)² − 5 (−3) + 4 = 9 + 15 + 4 = 28

(c) For x = −3,

x² + 5x = (−3)² + 5(−3) = 9 − 15 = −6