Question 311900
<pre><b>

{{{(x-12)^2=45}}}

Use the principle of square roots:

{{{x-12 = ""+-sqrt(45)}}}


{{{x=12+-sqrt(45)}}}

{{{x=12+-sqrt(9*5)}}}


{{{x=12+-sqrt(9)*sqrt(5)}}}

{{{x=12 +- 3*sqrt(5)}}}

{{{x=12 +- 3*2.236}}}

{{{x = 12+- 6.708}}}

Using the +,  {{{x=12 + 6.708=18.708}}}

Using the -,  {{{x=12 - 6.708=5.292}}}

Edwin</pre>