mutliplying exponents: a(3a - 4b^3)(5a^2 + 3b)

[zhyia]

a(3a – 4b³)(5a² + 3b)

 

[stapel]

Are you not familiar with how to multiply polynomials?

Please reply showing how far you have been able to get on your own, so the tutors can see where, specifically, you are having difficulty. Thank you.

Eliz.

 

[zhyia]

can i do it like this (3a^2-4b^3)(5a^2+3b)
15a^4-12ab^4
=3a^4b^4

i am sum what familar with mult. poly's

 

[stapel]

can i do it like this (3a^2-4b^3)(5a^2+3b)

No. To multiply the "a" through the (3a - 4b³), you must multiply it on every term in the parentheses, not just one or another term of your choice.

. . . . .Simplifying with Parentheses

15a^4-12ab^4

No. To multiply polynomials, you must multiply every term of each polynomial, not just one or another term of the polynomial of your choice.

. . . . .Multiplying Polynomials

=3a^4b^4

No. You can only combine "like" terms, not portions of any terms of your choice.

. . . . .Combining "Like" Terms

i am sum what familar with mult. poly's

Does the above mean "I am somewhat familiar with the process of multiplying polynomials"...?

Thank you.

Eliz.

 

[zhyia]

yes, but i am lost on this problem

 

[zhyia]

what about
(3a^2-4ab^3) (5a^2+3b)
if i foil this problem
i get
15a^4+9a^2b-20a^3b^3-12ab^4
then i would combine like terms? is this right so far?