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If \(\alpha\) and \(\beta\) are the zeroes of the polynomial \(x^2-11x+30\), what is the value of \((\alpha-\beta)^2\)?

Answer and explanation

Correct answer: 1

For the quadratic polynomial, \(\alpha+\beta=11\) and \(\alpha\beta=30\). Therefore, \((\alpha-\beta)^2=(\alpha+\beta)^2-4\alpha\beta=11^2-4(30)=121-120=1\). Hence, option A is correct. Exam tip: To find the square of the difference of the zeroes, use their sum and product; taking only \((\alpha+\beta)^2\) gives 121, not the required value.

Related tags

PolynomialsZeroes Of PolynomialQuadratic EquationsIdentitiesPolynomials In One VariableMathematicsClass 10 Mcq

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