Question 669665
when you were on this step...
{{{x^2 - 2x + 1 = -9}}}
...
{{{(x-1)^2 = -9}}}
...
{{{x-1 = +- sqrt(-9)}}}
...
x = {{{1 +- sqrt(-9)}}}
...
x = {{{1 +- sqrt(3*3*-1)}}}
...
x = {{{1 +- 3sqrt(-1)}}}
where i = {{{sqrt(-1)}}}
...
x = {{{1 +- 3i}}}
...
giving the answer
1 + 3i, 1-3i and 2
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