Q.

If f(x) is a continuous function for all real values of x satisfying x2+(f(x)-2)x+23-3-3f(x)=0 then the value of f(3) can be  

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a

1-3

b

2(1-3)

c

3

d

2(3-1)

answer is C.

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Detailed Solution

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As f (x) is continuous for all x∈R Thus limx→3 f(x)=f(3)

x2+(f(x)-2)x+23-3-3f(x)=0 ⇒x2-2x+23-3=f(x)3-x f(x)=x2-2x+23-33-x  ∴limx→3 f(x)=limx→3 x2-2x+23-33-x limx→3 (x-3)(x+3-2)(3-x)=2(1-3) 

Thus f(3)=2(1-3)

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