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The hypotenuse of a right triangle is 145 cm. One leg is 17 cm longer than the other leg. What is the length of the shorter leg?

Answer and explanation

Correct answer: \(\frac{\sqrt{41761}-17}{2}\,\text{cm}\)

Let the shorter leg be \(x\) cm; then the longer leg is \(x+17\) cm. By the Pythagorean theorem, \(x^2+(x+17)^2=145^2\), which simplifies to \(2x^2+34x-20736=0\). Applying the quadratic formula gives \(x=\frac{-17\pm\sqrt{41761}}{2}\). Since a length must be positive, the valid answer is \(\frac{\sqrt{41761}-17}{2}\) cm, approximately 93.68 cm. Option B results from using the wrong sign and is not a root of the equation. Exam tip: define the shorter leg first, use the Pythagorean theorem, and reject any negative length.

Related tags

Quadratic EquationsPythagorean TheoremRight TriangleWord ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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