Question

Which function has exactly one real solution?

A. f(r) = 612 + 1
B. f(x) = -4r² + 9r
C. f(r) = -3r² + 30r - 75
D. f(x) = 2r² + 4r - 5

Answer 1

C

Explanation:

f(r)＝-3r²+30r-75 need to make sure algebra are same