Let $a,$ $b,$ $c$ be real numbers such that
\[a + 3b + 4c = a^2 + b^2 + c^2 = 25.\]Find the largest possible value of $a.$
Question:
Let $a,$ $b,$ $c$ be real numbers such that
\[a + 3b + 4c = a^2 + b^2 + c^2 = 25.\]Find the largest possible value of $a.$
Answer:
Let's think step by step.

user
\frac{25}{13}
Let $a,$ $b,$ $c$ be real numbers such that
\[a + 3b + 4c = a^2 + b^2 + c^2 = 25.\]Find the largest possible value of $a.$
train