Question

Which function has real zeros at x = 3 and x = 7?

f(x) = x2 + 4x - 21
Cf(x) = x2 - 4x - 21
Cf(x) = x2 - 10x + 21
f(x) = x2 - 10x - 21

Answer 1

f(x) = x2 – 10x + 21

Explanation:

I got it because you substract and add the last part