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19 June, 05:39

An integer is 15 more than 2 tomes another. If the product of two integers is - 27 then find the integers

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  1. 19 June, 05:56
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    x = 9 and y = - 3

    Step-by-step explanation:

    Let's say the first integer is x and the second one is y. Then, if we put the words into mathematical expressions, we get:

    x = 15 + 2y

    xy = - 27

    We can use substitution to solve this system of equations. We put 15 + 2y in for x in xy = - 27:

    (15 + 2y) * y = - 27 ⇒ 2y² + 15y = - 27 ⇒ 2y² + 15y + 27 = 0

    Now, we have a quadratic to solve, so after some trial and error, we get:

    (2y + 9) * (y + 3) = 0

    Setting each of these to 0, we get two possible answers for y:

    y = - 9/2 or y = - 3.

    However, it says that y is an integer, so it can't be - 9/2 and must be - 3. We use this to find x:

    x = 15 + 2 * (-3) = 15 - 6 = 9

    So, the two numbers are x = 9 and y = - 3.
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