If the sum of two positive numbers is 25 and their difference is 7, what is the product of these two numbers?
Answer and explanation
Correct answer: D.
- Step 1: Let numbers be and . Then and .
- Step 2: Adding equations: .
- Step 3: Subtracting: .
- Step 4: Product is .
Answer
.
Why not the others: evaluates ; evaluates . does not fit.
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