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Q.

The domain of f(x)=x−5x+5+2−x2+x is

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a

(−∞, 2)∪(3, ∞)

b

(2, 3)

c

R

d

ϕ

answer is D.

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Detailed Solution

x−5x+5≥0 , 2−x2+x≥0 (x−5)(x+5)≥0     and x≠-5 ; (2−x)(2+x)≥0 and x≠-2                                                ⇒      x-2x+2≤0⇒x∈(−∞,−5)∪[5,∞); x∈(−2,2]Domain=ϕ  ( since the intersection of the two functions domains is φ)
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