# math,correction

posted by
**jas20**
.

Is this correct or no. I need help in a couple of problems can someone explain them to me.

Problem#1

directions: Factor each expression

a^2(b-c)-16b^2(b-c)

My answer is:

(b-c)(a-4b)(a+4b)

PROBLEM#2

dIRECTIONS: Find a value for k so that 2x^3-kxy^2 will have the facotors 2x,x-3y,and x+3y

MY steps:

=2x(x-3y)(x+3y)

=2x(x^2-9y^2)

=2x^3-18xy^2

so, k = 18

Problem#3

Directions: Factor each polynomial by grouping the first two terms and the last two terms.

x^3-4x^2+2x-8

MY answer:

(x-4)(x^2+2)

Looks OK!