It's a third-degree polynomial with four terms.
The number it represents completely depends on the value of 'x', and even
that doesn't tell you much, because if 'x' changes, then the value of the whole
expression also changes, in a flash.
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2x2 + 21x + 49 = 2x2 +14x +7x + 49 = 2x(x + 7) + 7(x + 7) = (2x + 7)(x + 7)
2x2 + 21x + 49= 2x2 + 14x + 7x + 49= 2x(x + 7) + 7(x + 7)= (x + 7)(2x + 7)
x2+14x+49 = (x+7)(x+7) when factored
d/dx 2x2+3x+7=4x+3
x=7