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What is the coefficient of (x^2) in (5x^2-3x+9)?

Answer and explanation

Correct answer: (5)

A coefficient is the numerical factor multiplied by a variable term. In the expression given, the terms are formed with different powers of x: the first term contains x squared, the second contains x, and the last is a constant. The coefficient must be read from the term containing the exact power asked for, not from another term or from the exponent itself.

The term containing x squared is 5x squared, written mathematically as \(5x^2\). Therefore, its numerical coefficient is 5, so option D is correct. The number 3 belongs to the x term and 9 is the constant term. The exponent 2 tells the power of x; it is not the coefficient. This distinction is useful when identifying coefficients in any polynomial.

Related tags

CoefficientQuadratic ExpressionX Square

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