(3b^3-4b^1-7)(2b^2-b^1-9) *multiplying polynomials *

Step-by-step explanation:

we have to find the multiplication of following polynomials

As we know that the multiplication of two polynomials are done in following way

let we have two polynomial (ax+b) and (cx+d) their product would be

(ax+b)(cx+d)

=ax(cx+d)+b(cx+d)

=acx² + axd + bcx + bd

Now similarly for the given polynomial we have

it could be written as

=3b³(2b²-b-9) -4b(2b²-b-9) -7(2b²-b-9)

Multiplying inside with values

=

Combining same values

=

=

21

step-by-step explanation: