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The difference between two numbers is (8) and their product is (425). What is the smaller number?

Answer and explanation

Correct answer: (17)

The direct answer is option B, 17. Let the smaller number be x. Since the difference is 8, the larger number is x+8. Their product is 425, so x(x+8)=425, or x^2+8x-425=0. Factoring gives (x-17)(x+25)=0, so x=17 or x=-25. For the intended positive numbers, the smaller number is 17; the pair is 17 and 25, whose difference is 8 and product is 425. Option A, 15, would give the other number 23 and product 345, so it fails. Option B, 17, works exactly. Option C, 20, would give 28 and product 560, so it is wrong. Option D, 25, is actually the larger number in the correct pair, not the smaller one. Exam cue: when a difference is given, write the larger number as smaller number plus the difference, then use the product.

Related tags

Quadratic EquationsDifference ProductApplication

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