Find all the values of C satisfying the given conditions: f(x)=x^2-7x+18 and f(c)=6

Answer 1

So you plug in 6 for f(x) and c for x and solve for the zeroes in c for the expression:

c² - 7c + 18 = 6

c² -7c +12 = 0 which is factorable and easy to solve.