factor this prob?

0 ⤊

factor this:
-y^2-2y+15=0

I got y= -5 and y = 3...but think it may be wrong

2007-05-05 06:34:33 · 2 answers · asked by confused 1 in Science & Mathematics ➔ Mathematics

First change signs:
y² + 2y -15 = 0.
Now factor
(y+5)(y-3) = 0
Solve
y = -5 and y = 3.
So you are correct.

2007-05-05 06:44:10 · answer #1 · answered by steiner1745 7 · 0⤊ 0⤋

-y^2-2y+15=0

-1(y-5)(y+3)=0
-1(5)=-5
-1(-3)=3
y=-5 y=3

2007-05-05 14:34:13 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋