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The two perpendicular sides of a right-angled triangle are \(x\) m and \(x+4\) m, and its hypotenuse is 20 m. What is the value of \(x\)?

Answer and explanation

Correct answer: 12

By the Pythagorean theorem, \(x^2+(x+4)^2=20^2\). Simplifying gives \(2x^2+8x-384=0\), or \(x^2+4x-192=0\). Factoring yields \((x-12)(x+16)=0\), so \(x=12\) or \(x=-16\). Since a side length cannot be negative, \(x=12\) m is the correct answer. Exam tip: In geometry word problems, reject any negative algebraic root when it represents a length.

Related tags

Quadratic EquationsPythagorean TheoremRight Triangle Word ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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