If fx2−6x+6+fx2−4x+4=2x∀x∈R then f(−3)+f(9)−5f(1)=
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a
7
b
8
c
9
d
10
answer is C.
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Detailed Solution
x2−6x+6=x2−4x+4⇒x=1 Put x=1 in the given relation to get f(1)=1 for x2−6x+6=1,x=1 or 5 for x2−4x+4=1,x=1 or 3 Put x=3 and 5 in the given relation to get f(−3)+f(1)=6⇒f(−3)=5and f(1)+f(9)=10⇒f(9)=9f(−3)+f(9)−5f(1)=9