Q. 1 I5.0( 2 Votes )

Write the correct alternative answer for each of the following questions.

Multiply (x2 -3) × (2x – 7x3 + 4) and write the degree of the product.
A. 5

B. 3

C. 2

D. 0

Answer :

The multiplication is as follows:


= (x2 -3) × (2x – 7x3 + 4)


= x2.2x – 7x3.x2 + 4x2 -3.2x + 3.7x3 -3.4


= 2.x2+1 – 7x3+2 + 4x2 -6x + 21x3-12


= 2x3 – 7x5 + 4x2 – 6x + 21x3 – 12


“.” represents Multiplication


Therefore the degree of the product is 5.


Option (B) is not correct as the degree does not match to the highest degree of the variable.


Option (C) is not correct as the degree does not match to the highest degree of the variable.


Option (D) is not correct as the degree does not match to the highest degree of the variable.


So option A is correct.

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