Evaluate and Find Difference of Function Values

Consider the function defined by the equation:

$$ f(x) = 2x^2 - 3x + 1 $$

Determine the value of $$ f(2) $$ and the value of $$ f \left( -1 \right) $$.

After calculating these values, find the difference $$ f(2) - f(-1) $$ and input your answer in the grid below.