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a^2-12a+27=0 The solution s is?

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Answer to a math question a^2-12a+27=0 The solution s is?

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Seamus
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92 Answers
${a}^{2}-12a=-27$
${a}^{2}-12a+?=-27+?$
${a}^{2}-12a+36=-27+?$
${a}^{2}-12a+36=-27+36$
${\left( a-6 \right)}^{2}=-27+36$
${\left( a-6 \right)}^{2}=9$
$\begin{array} { l }a=3,\\a=9\end{array}$
$\begin{array} { l }a_1=3,& a_2=9\end{array}$

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