Question

5. The function f: x-x² + 6x + k where k is a constant, is defined for x € R Find the range of f in terms of k​

Answer 1

f(x)= x²+6x+k

memiliki alar real hanya jika
D >=0
b²− 4a c >=0

6²− 4×1×k >=0
36− 4k >=0
4k <= 36
k <= 9

is the range of f(x)