A coefficient is a number paired with a variable. For example, in the equation
4x+2x=16, the numbers 4 and 2 would be coefficients.
Coefficients are the factors (usually constants) which are multiplied by the variables in each term. For example, in a second-degree polynomial equation,
y = ax2 + bx + c
a is called the quadratic coefficient, b is the linear coefficient and c is the constant term.
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The coefficient in an expression is the multiplier of the variable in the equation. Here, the coefficient would be 6.
Due to some perversity in human nature, it is called a coefficient!
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