A coefficient is a number in front of a variable. For example, in the
expression ^{2}-10x+25^{2} is 1 and the coefficient of the x is -10. The third
term, 25, is called a constant.

If the expression were -x^{2}+10x+25,
the coefficient of the x^{2} would be -1, and the coefficient of
the x would be 10.

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