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a
7-40,7+40
b
0,7+40
c
7-40,∞
d
none of these
answer is D.
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Detailed Solution
fx=14x-x2-10x+9 For fxto be defined, x2-10x+9<4x or x2-10x+9<4x and x2-10x+9>-4x or x2 -14x+9<0 and x2-6x+9>0 or x∈7-40,7+40 and x∈R-3 or x∈7-40,3∪3,7+40