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Question 17
Consider the function f(x) = (x + 4)(x + 6)(x + 8) ⋯ (x + 98). The number of integers x for which f(x) < 0 is:
Solution
The critical points of the function are -4, -6, -8, ... , -98 ( 48 points).
For all integers less than -98 and greater than -4 f(x) > 0 always .
for x= -5, f(x) < 0
Similarly, for x= -9, -13, ...., -97 (This is an AP with common difference -4)
Hence, in total there are 24 such integers satisfying f(x)< 0.
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