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echomelody
Find the maximum or minimum of the following quadratic function: y =x2 - 2x - 48.
You need to differentiate that y'=2x-2 make that equal to 0 2x-2=0 2x=2 x=1 That will be minimum or a maximum y=-49 when x=1 y=-48 when x=2 Looks like a minimum at 1.