What is m in this equation m times Parenthesis m minus 6 parenthesis equals 91?

m(m - 6) = 91

m(m) + m(-6) = 91

m2 - 6m = 91 subtract 91 from both sides

m2 - 6m - 91 = 0 since -91 = (-13)(7) and -13 + 7 = -6, then

(m + 7)(m - 13) = 0

m + 7 = 0 or m - 13 = 0

m = -7 or m = 13