CTET 2 Math and Science Feb 2015 Paper

Question : 60 of 120

Marks: +1, -0

In the product

(x^2 – 2) ( 1 – 3x + 2x^2)

the sum of coefficients of

x^2

and x is

Solution:

(x^{2}-2)(1-3x+2x^{2})

=x^{2}-3x^{3}+2x^{4}-2+6x-4x^{2}

=2x^{4}-3x^{3}-3x^{2}+6x-2

Now, the sum of co-efficient of

x^2

and

x=–3+6=3

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