Let $x,$ $y,$ $z$ be real numbers such that $4x^2 + y^2 + 16z^2 = 1.$  Find the maximum value of
\[7x + 2y + 8z.\]
Question:
Let $x,$ $y,$ $z$ be real numbers such that $4x^2 + y^2 + 16z^2 = 1.$  Find the maximum value of
\[7x + 2y + 8z.\]
Answer:
Let's think step by step.

user
\frac{9}{2}
Let $x,$ $y,$ $z$ be real numbers such that $4x^2 + y^2 + 16z^2 = 1.$  Find the maximum value of
\[7x + 2y + 8z.\]
train