Find and correct the errors in the following mathematical statement. S

1.	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
Answer» (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

Answer»

(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

x² + 5x = (−3)² + 5(−3)

= 9 − 15 = −6