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Q.

If  (3x10+2x82)x10+x8+14x6dx=f(x)+C (where C is constant of integration, x > 0) and  f(1)=6345 then the value of  (80f(2))45183 is

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a

1

b

4

c

7

d

10

answer is C.

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Detailed Solution

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(3x10+2x82)(x10+x8+1)14x6dx =(3x10+2x82)×(x4)14(x6+x4+x4)14x6dx (3x5+2x32x5)(x6+x4+x4)14dx x6+x4+x4=t4 (6x5+4x34x5)dx=4t3dt (3x5+2x32x5)dx=2t3dt =(t)(2t3)dt=2t55+C =25[x6+x4+x4]54+C f(1)=25(1+1+1)54=25(3)54=6.(3)145 f(2)=25[26+24+24]54=25[210+28+1]5425=180[1281]54

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