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28-04-2017
Mathematics

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How do you solve the equation u^2-8=7u by factoring?

Respuesta :

28-04-2017

[tex]u^2-8=7u[/tex]
[tex]u^2-7u-8=0[/tex]
[tex]u^2-8u+u-8=0[/tex]
[tex]u(u-8)+(u-8)=0[/tex]
[tex](u-8)(u+1)=0[/tex]
[tex]\boxed{u=8\lor u=-1}[/tex]

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