Let $a,$ $b,$ and $c$ be distinct real numbers.  Simplify the expression
\[\frac{(x + a)^2}{(a - b)(a - c)} + \frac{(x + b)^2}{(b - a)(b - c)} + \frac{(x + c)^2}{(c - a)(c - b)}.\]
Question:
Let $a,$ $b,$ and $c$ be distinct real numbers.  Simplify the expression
\[\frac{(x + a)^2}{(a - b)(a - c)} + \frac{(x + b)^2}{(b - a)(b - c)} + \frac{(x + c)^2}{(c - a)(c - b)}.\]
Answer:
Let's think step by step.

user
1
Let $a,$ $b,$ and $c$ be distinct real numbers.  Simplify the expression
\[\frac{(x + a)^2}{(a - b)(a - c)} + \frac{(x + b)^2}{(b - a)(b - c)} + \frac{(x + c)^2}{(c - a)(c - b)}.\]
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