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On the graph of the standard function \(y=x^2\), if \(y=25\), what are the possible values of \(x\)?

Answer and explanation

Correct answer: 5 and −5

Substituting \(y=25\) in the function gives \(x^2=25\). Hence, \(x=5\) or \(x=-5\), so both values are possible. Choosing only 5 or only −5 is incorrect because both a positive and a negative number can have the square 25. In exams, remember that for \(x^2=a\) with \(a>0\), \(x=\pm\sqrt{a}\).

Related tags

Relations And FunctionsGraphs Of Standard FunctionsQuadratic EquationsSquare RootsMathematicsClass 11 Mcq

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