Answer:
f(x) = -0.32x² +3.2x +4
Explanation:
Standard form is the same equation with the parentheses eliminated and like terms combined. It is written with the powers of the variable in decreasing order.
When simplifying the square of a binomial, it can help to have in mind the form ...
(a -b)² = a² -2ab +b²
Your equation simplifies to ...
f(x) = -0.32(x -5)² +12
= -0.32(x² -10x +25) +12
= -0.32x² +3.2x -8 +12
f(x) = -0.32x² +3.2x +4