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10 May, 13:32

When the sum of 8 and twice a positive number is subtracted from the square of the? number, 0 results. Find the number.

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  1. 10 May, 17:09
    0
    4

    Step-by-step explanation:

    The equation is

    x^2 - (2x + 8) = 0 where x is the number to be found.

    removing the parentheses by distributing the negative:-

    x^2 - 2x - 8 = 0

    (x - 4) (x + 2) = 0

    x = 4, - 2.

    The value of x must be 4 because it is positive.
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