22.4 is the correct ansewer try it on a calculater
Answer:
72 pizzas were eaten
Step-by-step explanation:
F(2)=4(2)-3=5
f(6)=4(6)-3=21

Now completing the square.

(x+5)² = 16 is the rewritten equation... For first question btw.
For the solutions to the equation -

x = -1,-9 is the solution, for the second question.
Answer:
the answer is 5x an exponent at the top of the x +15