Question

Will medal: Factor the trinomial x^2-18x+81
a: (x-8)^2
b: (x-9)^2
c: (x+8)^2
d: (x+9)^2
e: none of these

Answer 1

x^2 - 18x + 81 = x^2 - 2*9*x + 9^2

Answer 2

a^2 - 2*b*a + b^2 = (a-b)^2