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If the product of two consecutivepositive odd integers is 255, whatis the larger integer |
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Answer» Answer: Consecutive odd integers are 2 apart from each other. So if one odd integer is x then the next one is 2 more: x+2. So to say "The product of TWO consecutive positive odd integers is 255" as a number sentence we WOULD use: %28x%29%2A%28x%2B2%29+=+255 To solve this we will start by simplifying: x%5E2+%2B+2x+=+255 This is a quadratic equation. So we will GET one side equal to zero (by subtracting 255 from each side): x%5E2+%2B+2x+-+255+=+0 Now we EITHER factor the left side and use the Zero Product Property or use the Quadratic Formula. I'll factor: %28x+-+15%29%28x%2B17%29+=+0 According to the Zero Product Property this product can be zero only if one of the factors is zero. So: x-15+=+0 or x%2B17+=+0 Solving these we get: x+=+15 or x+=+-17 Rmemeber, that x REPRESENTS the first of the two consecutive odd integers. x+2 represnts the second. So we get two pairs of consecutive odd integers: 15 and 17 (when x = 15) and -17 and -15 (when x = -17) Since the problem doesn't exclude negative numbers both pairs of numbers are solutions to the problem. |
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