help please?

0 ⤊

Factor the following polynomial or indicate if it is prime.
7zy^3 + 42zy^2 + 56zy

2007-07-09 05:10:58 · 3 answers · asked by Chillin with my peeps 1 in Science & Mathematics ➔ Mathematics

3 answers

Common factor 7zy
7zy(y^2+6y+8)
7zy(y+2)(y+4)

2007-07-09 05:16:11 · answer #1 · answered by Anonymous · 0⤊ 0⤋

Well, it's pretty easy to start by factoring out a z and a y:

z * y * (7y^2 + 42y + 56)

Then we can pull out a 7:

7 * y * z * (y^2 + 6y + 8)

That leaves a simple quadratic. But I'll cheat, since I know that 6 is the sum of two factors of 8:

7 * y * z * (y + 2) * (y + 4)

Get it? 2 + 4 = 6, and 2 * 4 = 8. Anyway, there it is, all factored!

2007-07-09 12:20:12 · answer #2 · answered by El Jefe 7 · 0⤊ 0⤋

7zy(y^2+6y+8)
7zy(y+4)(y+2)

2007-07-09 12:14:49 · answer #3 · answered by leo 6 · 0⤊ 0⤋