Question

Find the maximum or minimum of the following quadratic function: y =x2 - 2x - 48.

Answer 1

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.