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19 May, 17:51

X^2 = 8x - 15

...

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  1. 19 May, 19:39
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    Answer: x = 5

    Step-by-step explanation: Lets solve by completing the square.

    You first need to get - 15 by itself.

    x^2-8x=15 Now you need to complete the square my finding a perfect constant that will go with x^2-8x, then add it to the other side containing - 15 to balance the equation out.

    -8x/2 = - 4^2=16 This will be the perfect square.

    x^2-8x+16 = - 15 + 16

    (x-4) ^2 = 1 factor into a binomial, then use the square root on both sides.

    √ x-4 ^ 2 = √ 1

    x-4 = 1

    x=5
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