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If \(p(x)=x^2-49\), which of the following is one value of \(a\) for which \(p(a)=0\)?

Answer and explanation

Correct answer: \(a=7\)

For \(p(a)=0\), we need \(a^2-49=0\), so \(a^2=49\) and \(a=\pm 7\). Among the given options, \(a=7\) is correct; \(a=-7\) is the other zero. Substituting \(0\), \(6\), or \(49\) does not make the polynomial zero. Exam tip: The zeros of \(x^2-c^2\) are \(x=\pm c\).

Related tags

PolynomialsZeros Of PolynomialDifference Of SquaresPolynomial EvaluationPolynomials In One VariableMathematicsClass 10 Mcq

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