funderburk41
funderburk41
03-10-2016
Mathematics
contestada
vertex form of
y=x^2-4x-9
Respuesta :
apologiabiology
apologiabiology
03-10-2016
complete the square
first isolate x terms
y=(x^2-4x)-9
complete square inside (take 1/2 of square of b )
-4/2=-2, (-2)^2=4
add 4-4 inside
y=(x^2-4x+4-4)-9
complete the square
y=((x-2)^2-4)-9
y=(x-2)^2-4-9
y=(x-2)^2-13
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