Column –IColumn - IILet fx=x3−x2+10x−5;x≤1−2x+log2b2−2;x>1has local maximum at x = 1 value of b can be
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a
A-P, B-Q,C-R,D-S
b
A- QR, B- ST, C-PR, D- PQ
c
A-Q,B-PQR,C-ST,D-RST
d
A-QR,B-P, Q, R, S, C-P Q R S T, D-Q, R, S, T
answer is D.
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Detailed Solution
A) 21-4a-a2≥0a2+4z−21≤0 ⇒ a+7a−3≤0a∈−7,3f'x=31−21−4a−a2a+1x2+5>0 for all x∈R ,since fx is strictly increasing ⇒ 31−21−4a−a2a+1≥0 and a∈-7,3⇒a can be 2 or 3 from the column II B) f'(x)=3x2+2(a+2)+3af'x≥0 ∀x∈R⇒D≤022a+22−433a≤0a+22−9a≤0a2+4a+4−9a≤0a2−5a+4≤0 ⇒ a∈1,4 (C) since logx 1 and logx=xe at x=e ⇒if 0
1e⇒number of solutions of logx=pxis 1 (D) b2-2>0⇒|b|>2f1≥−2+log2b2−2⇒5≥-2+log2b2−2⇒b2−2≤128⇒b≤1302