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Q.

Iffx=x2-bx+25x2-7x+10forx5 is continuous at x = 5, then the value of f(5) is

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a

0

b

5

c

10

d

25

answer is A.

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Detailed Solution

fx=x2-bx+25x2-7x+10,x5fxiscontinuousatx=5onlyiflimx5x2-bx+25x2-7x+10isfinite.Now,x2-7x+100whenx5.Thenwemusthavex2-bx+250forwhichb=10.Hence,limx5x2-10x+25x2-7x+10=limx5x-5x-2=0.

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