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The two perpendicular sides of a right triangle are \(x\) cm and \((x+7)\) cm, and its hypotenuse is \((x+8)\) cm. What is the length of the smallest side?

Answer and explanation

Correct answer: 5 cm

By the Pythagorean theorem, \(x^2+(x+7)^2=(x+8)^2\). On simplifying, \(x^2-2x-15=0\), so \((x-5)(x+3)=0\). Thus, \(x=5\) or \(x=-3\); a length cannot be negative, so \(x=5\) cm. Since \(x\) is smaller than \(x+7\), the smallest side is 5 cm. Exam tip: Apply the Pythagorean theorem first and reject any negative root because side lengths are positive.

Related tags

Quadratic EquationsPythagorean TheoremRight TriangleWord ProblemsAlgebraic EquationsWord Problems And ApplicationsMathematicsClass 10 Mcq

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