Given f(x)=x²-36, which statement is true?
A The only zero, 6, can be found when 0 =(x - 6Xx-6).
The only zero, 18, can be found when 0=(x - 18Xx - 18).
The zeros, -6 and 6, can be found when 0 = (x + 6Xx − 6).
The zeros, -18 and 18, can be found when 0 = (x + 18)(x − 18).