The answer is -13
1 would become 1^2
-5 becomes -5x
and -13 stays as it is
y = a ( x - h)^2 + v
a is positive when the parabola opens up and negative when it opens down.
F(x) = 2 * 2 ^x
f(-2) = 2 * 2^-2
f = 0.5

Convert decimals to fractions

Multiply both sides by 10

Move expression to the left.

Remove zero.

Solve the quadratic equation.

Remove parenthesis and calculate.

Add the numbers

Separate the solutions

The final solution are