Question 254877
2)
f(x)=a^2+bx+c
x^2-2x-6 
a is positive so there is a minimum.
minimum at x=-b/2a=2/2=1
minimum at y=1-2-6=-7
Domain is all real numbers
Range is [-7, infinity)
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Ed
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{{{graph(500,500,-10,10,-10,10,x^2-2x-6)}}}