How do you write $F(x) = x^2 + 2x$ in vertex form?

Jun 13, 2018

$f(x)=(x+1)^2-1$

$"use "color(blue)"completing the square"$

$f(x)=x^2+2xcolor(red)(+1)-1$

$color(white)(f(x))=(x+1)^2-1$

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How do you write F(x) = x^2 + 2xF(x) = x^2 + 2x in vertex form?