Question

Please solve (r-3)(r+6)=0

Answer 1

r - 3 =0
r - 3 + 3 = 0 + 3
r = 3

r + 6 = 0
r + 6 - 6 = 0 - 6
r = -6

r = 3, -6

Answer 2

set each parenthesis against 0
r-3=0
r=3

r+6=0
r=(-6)