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The steps you follow to maximize a quantity are the same as the steps to minimize a quantity, explain why?

Im not sure why???

I know to maximize or minimize a quantity, you find the derivative, let it equal 0 and solve to find the value of the variable that results in a maximum or minimum, then you find the maximum or minimum value (if required) by substitution, then check to see you have the maximum or minimum by test-second derivative if >0 then min, if <0 max. Can any one please explain to me why???THANKS SOO MUCH!

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# 1 more quick calculus question

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