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If the zeroes of the polynomial \(p(x)=x^2-(m+3)x+12\) are 3 and 4, what is the value of \(m\)?

Answer and explanation

Correct answer: 4

For a quadratic polynomial \(ax^2+bx+c\), the sum of its zeroes is \(-\frac{b}{a}\). Here, the sum of the zeroes is \(3+4=7\), while the given polynomial shows that this sum is \(m+3\). Thus, \(m+3=7\), giving \(m=4\). As a check, the product of the zeroes is \(3\times4=12\), which agrees with the constant term. Exam tip: In the form \(x^2-Sx+P\), the sum of the zeroes can be read directly as \(S\).

Related tags

PolynomialsZeroes Of PolynomialSum Of ZeroesQuadratic PolynomialVieta FormulasPolynomials In One VariableMathematicsClass 10 Mcq

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