Question

By completing square
y^2+6y-216=0​

Answer 1

Answer: zeros are 12 ,-18.

Step-by-step explanation:

y^2+6y-216=0

y^2+18y-12y-216=0

y(y+18)-12(y+18)=0

(y+18)(y-12)=0

y=12 or y=-18