Food for Thought

SmartAlec says:
When I expand (2x + 7)(x - 1), I get 2x^2 + 5x - 7.
I can use my calculator to help me check if my answer is correct.

For instance, if x = 2, 
(2x + 7)(x - 1) = 11
and
2x^2 + 5x - 7 = 11
That means I have done my expansion correctly.

I can safely say, I can do this with any value of x and for any given expression.

Do you agree? Justify your argument with example(s).

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