Subject :IMO Class : Class 8

The product of (*x*^{2} + 3*x* + 5) and (*x*^{2} – 1) is ____.

A *x*^{4} + 3*x*^{3} – 4*x*^{2} – 3*x* – 5

B *x*^{4} + 3*x*^{3} + 4*x*^{2} – 3*x* – 5

C *x*^{4} + 3*x*^{3} + 4*x*^{2} +3*x* – 5

D *x*^{4} + *x*^{3} + x + 5

## Ans 3:

#### Edit Post

Class : Class 8

Solution,
=x²(x²+3x+5)-1(x²+3x+5)
=x²*²+3x³+5x²-x²-3x-5
=x²*²+3x³+4x²-3x-5
Answer is option (b).

## Ans 6:

#### Edit Post

Class : Class 8

Solution,
=x²(x²+3x+5)-1(x²+3x+5)
=x²*²+3x³+5x²-x²-3x-5
=x²*²+3x³+4x²-3x-5
Answer is option (b).