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What is the value of b in the quadratic equation \(5x^2-9x+4=0\)?

Answer and explanation

Correct answer: -9

A quadratic is written as \(ax^2+bx+c=0\), where \(b\) is the coefficient of \(x\). In \(5x^2-9x+4=0\) the coefficient of \(x\) is \(-9\), so \(b=-9\). The option 5 is the coefficient \(a\), 4 is the constant term \(c\), and 9 is just the positive opposite of the correct value. Exam tip: rewrite the equation in the form \(ax^2+bx+c\) and read off the coefficient of \(x\) to avoid sign mistakes.

Related tags

Quadratic EquationsCoefficientB ValuePolynomialsIntroduction To Quadratic EquationsMathematicsClass 10 Mcq

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