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If \(p(x)=x^2+ax+a\) and \(p(1)=0\), what is the value of \(a\)?

Answer and explanation

Correct answer: \(-\frac{1}{2}\)

Substituting \(x=1\) in the polynomial gives \(p(1)=1+a+a=1+2a\). Since \(p(1)=0\), we get \(1+2a=0\), so \(2a=-1\) and \(a=-\frac{1}{2}\). Therefore, option A is correct. Option C has the wrong sign; if \(a=\frac{1}{2}\), then \(p(1)=2\), not zero. Exam tip: When a polynomial value is specified, substitute the given value of \(x\) directly and simplify the resulting equation.

Related tags

Polynomial EvaluationParameter DeterminationSubstitutionLinear EquationPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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