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The legs of a right triangle are x cm and (x + 12) cm, and the hypotenuse is 60 cm. What is the value of x?

Answer and explanation

Correct answer: 36

For a right triangle, the Pythagorean theorem states that the sum of the squares of the two perpendicular legs equals the square of the hypotenuse. Therefore x² + (x + 12)² = 60². Expanding gives 2x² + 24x + 144 = 3600, or x² + 12x − 1728 = 0. Factoring gives (x − 36)(x + 48) = 0, so x = 36 or −48. Lengths must be positive, hence x = 36 and option B is correct. Checking: 36² + 48² = 1296 + 2304 = 3600 = 60². The other choices do not satisfy the Pythagorean equation. The governing concept is using a geometric relation to form and solve a quadratic equation, while retaining only a physically meaningful positive length.

Related tags

Quadratic EquationsPythagorean TheoremRight TriangleWord Problems And ApplicationsMathematicsClass 10 Mcq

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