Answer:
(i) Let y = (x2
? 5x + 8) (x3 + 7x + 9)
+
(x3 + 7x ? 9) (2x ? 5)
= 3x4
+ 7x2 ? 15x3 ? 35x + 24x2 + 56 + 2x4
?5x3
+ 14x2 ?35x + 18x ? 45
(ii) Let y = (x2
? 5x + 8) (x3 + 7x + 9)
=x5 ?
5x4 + 15x3 ? 26x2 + 11x + 72
(iii) Let y = (x2
? 5x + 8) (x3 + 7x + 9)
Diff.w.r.t. x
Hence in all the three cases, we have the
same answer.
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