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Subject :IMO    Class : Class 8

The product of (x2 + 3x + 5) and (x2 – 1) is ____.

A x4 + 3x3 – 4x2 – 3x – 5
B x4 + 3x3 + 4x2 – 3x – 5
C x4 + 3x3 + 4x2 +3x – 5
D x4 + x3 + x + 5


Ans 1:

Class : Class 8
B

Ans 2:

Class : Class 8
B

Ans 3:

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 4:

Class : Class 8
B

Ans 5:

Class : Class 8
B

Ans 6:

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).

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