Answer: x=9
Step-by-step explanation:
X2-18x+81
Factors of 81 are -9 and -9
X2-9x-9x+81=0
X(x-9)-9(x-9)=0
(X-9)(x-9)=0
(X-9)=0 or (x-9)=0
X=0+9
X=9
