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Question

To evaluate dx(x1)x2+3x2 one of the most suitable substitution could be

A
x2+3x2=u
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B
x2+3x2=(ux2)
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C
x2+3x2=u(1x)
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D
x2+3x2=u(x2)
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Solution

The correct options are
C x2+3x2=u(1x)
D x2+3x2=u(x2)
x2+3x2=x2+2x+x2=x(x2)+1(x2)=(1x)(x2)
has real roots 1 and 2
So from case III: x2+3x2=u(1x) or u(x2)

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