If $y = 8 - 5x +4x^2$, what is the value of $y$ when $x=-2$?
This is a problem where I need to substitute the value of $x$ into the equation for $y$ and simplify. I start by replacing every $x$ in the equation with $-2$ and putting parentheses around them: $y = 8 - 5(-2) + 4(-2)^2$. Next, I follow the order of operations and evaluate the exponents first: $y = 8 - 5(-2) + 4(4)$. Then, I multiply: $y = 8 + 10 + 16$. Finally, I add: $y = 34$. 