If $x$ is a real number, find $49x^2+14x(19-7x)+(19-7x)^2$.
Question:
If $x$ is a real number, find $49x^2+14x(19-7x)+(19-7x)^2$.
Answer:
Let's think step by step.

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If $x$ is a real number, find $49x^2+14x(19-7x)+(19-7x)^2$.
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