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A ladder is 25 units long. The distance of its foot from the wall is 17 units less than the height reached on the wall. What is the height reached by the ladder on the wall?

Answer and explanation

Correct answer: 24 units

Let the height reached on the wall be \(x\) units. Then the distance of the foot of the ladder from the wall is \(x-17\) units. By the Pythagorean theorem, \(x^2+(x-17)^2=25^2\). This gives \(x^2-17x-168=0\), or \((x-24)(x+7)=0\). Thus \(x=24\) units, since a physical length cannot be negative. Exam tip: reject any negative root when solving a word problem involving length or distance.

Related tags

Quadratic-EquationsWord-ProblemsPythagorean-TheoremLadder-ProblemsApplicationsWord Problems And ApplicationsQuadratic EquationsMathematics

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