Answer:
x=9
Step-by-step explanation:
f(x) = −(x − 7)2 + 4
(substitute f(x) = 0)
0= −(x − 7)2 + 4
(distribute 2 into brackets)
0= −(2x - 14) + 4
(remove brackets and change the sign of each expression inside the brackets)
0= - 2x + 14 + 4
(add the numbers)
0= - 2x + 18
(move variable to the other side and change its sign)
2x = 18
(divide both sides by 2)
x = 9
