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21 April, 08:44

What multiples to 42 and adds to - 2

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  1. 21 April, 10:25
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    Step-by-step explanation:

    xy = 42

    x+y = - 2 Substitute into the top equation

    y = - 2 - x Put in for y

    x (-2 - x) = 42 Remove the brackets

    -2x - x^2 = 42 Subtract 42 from both sides.

    -2x - x^2 - 42 = 0 Put in the more normal order.

    -x^2 - 2x - 42 = 0 Multiply by - 1

    x^2 + 2x + 42 = 0

    This cannot be factored. It gives complex roots as it is written. I will give you the answer but I kind of doubt the question is correct.

    x1 = - 1 + 6.40i

    x2 = - 1 - 6.40i

    Leave a comment if you have a correction.
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