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Q.

If  x3+4=x2+312  , then the value of x  is

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a

1

b

12

c

12

d

3

answer is D.

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Detailed Solution

When x=1

x3+4=x2+312

13+41=12+72

1+123=1+72

133=82

When x=12

x3+41=x2+312

123+41=122+312

4+4=6+72

8=192

L.H.SR.H.S

When x=12

x3+4=x2+312

(12)3+4=(12)2+72

1+246=1+144

236=154

L.H.SR.H.S

When x=3

x3+4=x2+312

33+4=32+72

1+4=3+72

5=5

L.H.S=R.H.S

 the value of x  is '3'

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