Question 319042
{{{ f(x)= x^2-2x-3}}}
Take (1/2) of the x-coefficient and square it to complete the square.
Add and subtract that quantity from the equation.
{{{(1/2)(-2)=-1}}}<--- (1/2) of the x-coefficient
{{{(-1)^2=1}}}<--- Squared
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{{{f(x)=(x^2-2x+1)-3-1}}}
{{{f(x)=(x-1)^2-4}}}