You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VIII

Mathematics

Algebraic Expressions

ii Find and c...

Question

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

Open in App

Solution

$F o r x = - 3 x^{2} - 5 x + 4 = (- 3)^{2} - 5 (- 3) + 4 = 9 + 15 + 4 = 28$

Suggest Corrections

Similar questions

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

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

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

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

Join BYJU'S Learning Program

Explore more

Algebraic Expressions

Standard VIII Mathematics

Join BYJU'S Learning Program

Question 10(ii) Find and correct the errors in the following mathematical statement. Substituting x=−3 in x2−5x+4 gives (−3)2−5(−3)=9−15+4=−2

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

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

$F o r x = - 3 x^{2} - 5 x + 4 = (- 3)^{2} - 5 (- 3) + 4 = 9 + 15 + 4 = 28$