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

Algebraic Expressions

Question 10ii...

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

x = - 3

x^{2} + 5 x + 4 g i v e s (- 3)^{2} + 5 (- 3) + 4 = 9 + 2 + 4 = 15

x = - 3

x^{2} + 5 x + 4

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

x^{2} - 5 x + 4

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

x^{2} + 5 x

(- 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

Find and correct the errors in the following mathematical statements:

i.)Substituting x= -4 in $x^{2}$ +6x+4 gives $(- 4)^{2}$ ;+ 6(-4) + 4 = 16-24+4 = -4

ii.) 3x/(3x+2) = ½

Join BYJU'S Learning Program

Explore more

Join BYJU'S Learning Program