x^2-5x=64.

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x^2-5x=64.
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x^2-5x=64.
x^2-5x=64.

x^2-5x=64.
x^2-5x=64
x^2-5x+25/4=281/4
(x-5/2)²=(√281/2)²
x-5/2=±√281/2
x=(5±√281)/2
x1=(5+√281)/2,x2=(5-√281)/2

答：
x^2-5x=64
x^2-5x+25/4=64+25/4
(x-5/2)^2=281/4
x-5/2=±√281 /2
x=(5±√281)/2

x^2-5x=64
x^2-5x-64=0
x=（5±根号下25+4*64）/2
x=(5±根号281）/2

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