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January 30, 2015

Posted by **kim** on Wednesday, June 10, 2009 at 11:01am.

-8z(-9z^2-z-1)

- prealgebra -
**MathMate**, Wednesday, June 10, 2009 at 11:05amStart with the distributive law:

A(B+C)

=AB+AC

and similarly

A(B+C+D)

=AB+AC+AD

Try:

4x(5x^{2}+3x+2)

=4x*5x^{2}+ 4x*3x + 4x*2

=20x^{3}+ 12x^{2}+ 8x

Can you try your problem now?

- prealgebra -
**kim**, Wednesday, June 10, 2009 at 11:15ami still dont understand on how to do the problem

- prealgebra -
**kim**, Wednesday, June 10, 2009 at 11:19amwould the answer for the problem that i sent you be 72z^3-8z^2-1

- prealgebra -
**PsyDAG**, Wednesday, June 10, 2009 at 11:34amYou have to multiply -8z by

*all*terms. Also remember that a negative times a negative equals a positive.

72z^3 + 8z^2 + 8z

I hope this helps a little more. Thanks for asking.

- prealgebra -
**Kimberly**, Wednesday, June 10, 2009 at 3:28pmsimplify:

can someone please help me solve this problem?

Thank You

(2k+7)(7k-1)

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