What is the answer to r²+15r+36=0

R=-3

r=-12

one of them is the answer

R2 was replaced by r^2

Factoring r2 - 12r+36

The first term is, r2 its coefficient is 1.

The middle term is - 12 its coefficient is 12.

The last term is + 36

-36+-1=-37

-18+-2=-20

-12+-3=-15

-9+-4=-13

-6+-6=-12

Rewrite the polynomial splitting the middle term using the two factors found in step two above:

-6 and - 6

r2-6r-36r

r * (r-6)

6 * (r-6)

(r-6) * (r-6)

(r-6) ^2=0

r=6

The Answer is r=6