Let f,g:−1,2→ℝ be continues functions which are twice differentiable on the interval −1,2. Let the values of f and g at the points −1,0 and 2 be as given in the following table: In each of the intervals −1,0 and 0,2 the function f−3g" never vanishes. Then the correct statement (s) is (are)
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a
f'x−3g'x=0 has exactly three solutions in −1,0∪0,2
b
f'x−3g'x=0 has exactly one solution in −1,0
c
f'x−3g'x=0 has exactly one solution in 0,2
d
f'x−3g'x=0 has exactly two solutions in (-1,0) and exactly two solutions in 0,2
answer is B.
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Detailed Solution
Consider the function hx=fx-3gx Then h-1=3, h0=3 ⇒By RMVT, h1x=0 has a solution in -1,0 Also h0=3, h2=3 ⇒By RMVT, h1x=0 has a solution in 0,2 Since h11x≠0 ∀x∈-1,0 and 0,2 ⇒h1x=0 has exactly one solution in -1,0 and has exactly one solution in 0,2. That is, f1x-3g1x=0 has exactly one solution in -1,0 and has exactly one solution in 0,2. ∴options 2,3 are correct.