Since everyone has answered correctly, let's use a different approach.
[math]\displaystyle \left \{\begin {align} a+b&=8\\ ab&=k\end {align} \right . \tag*{}[/math]
Whenever you see a system of equations like this you can automatically change it to [math]x^2-8x+k=0[/math], where [math]a[/math] and [math]b[/math] are ...
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