Q.
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