08-06-2016
Mathematics

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Find the roots of the quadratic equation x^2-8x=9 by completing the square. Show your work.

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nobillionaireNobley nobillionaireNobley

12-06-2016

[tex] x^{2} -8x=9 \\ x^{2} -8x+(-4)^{2} = 9 + (-4)^{2} \\ x^{2} -8x+16 = 9 + 16 \\ (x-4)^{2} =25 \\ x-4= \sqrt{25} \\ x-4= \pm 5 \\ x= \pm 5+4[/tex]
x = 5 + 4 or -5 + 4
x = 9 or -1

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