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The product of two consecutive odd integers is 1 less than four times their sum. Find the integers.

Mathematics

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Answer

7 and 9 or −1 and 17 \text{ and } 9 \text{ or } -1 \text{ and } 1

Step-by-step solution

4 steps
  1. Define the consecutive odd integers.

    Let the first odd integer be xx.
    Since the integers are consecutive and odd, the next odd integer will be x+2x+2.

  2. Formulate the equation based on the given information.

    The product of the two consecutive odd integers is x(x+2)x(x+2).
    Their sum is x+(x+2)=2x+2x + (x+2) = 2x+2.
    Four times their sum is 4(2x+2)4(2x+2).
    The problem states that the product is 1 less than four times their sum.
    So, the equation is:

    x(x+2)=4(2x+2)−1x(x+2) = 4(2x+2) - 1
  3. Solve the quadratic equation for xx.

    Expand both sides of the equation:

    x2+2x=8x+8−1x^2 + 2x = 8x + 8 - 1 x2+2x=8x+7x^2 + 2x = 8x + 7

    Rearrange the terms to form a standard quadratic equation ax2+bx+c=0ax^2 + bx + c = 0:

    x2+2x−8x−7=0x^2 + 2x - 8x - 7 = 0 x2−6x−7=0x^2 - 6x - 7 = 0

    Factor the quadratic equation:
    We need two numbers that multiply to -7 and add to -6. These numbers are -7 and 1.

    (x−7)(x+1)=0(x-7)(x+1) = 0

    Set each factor to zero to find the possible values for xx:

    x−7=0  ⟹  x=7x-7 = 0 \implies x = 7 x+1=0  ⟹  x=−1x+1 = 0 \implies x = -1
  4. Find the pairs of consecutive odd integers.

    Case 1: If x=7x = 7
    The first integer is 7.
    The second integer is x+2=7+2=9x+2 = 7+2 = 9.
    The pair of integers is (7,9)(7, 9).

    Case 2: If x=−1x = -1
    The first integer is −1-1.
    The second integer is x+2=−1+2=1x+2 = -1+2 = 1.
    The pair of integers is (−1,1)(-1, 1).

    Both pairs satisfy the given condition.

    The integers are 7 and 9 or −1 and 17 \text{ and } 9 \text{ or } -1 \text{ and } 1.

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