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anonymous
 one year ago
Using the completingthesquare method, find the vertex of the function f(x) = –2x^2 + 12x + 5 and indicate whether it is a minimum or a maximum and at what point
anonymous
 one year ago
Using the completingthesquare method, find the vertex of the function f(x) = –2x^2 + 12x + 5 and indicate whether it is a minimum or a maximum and at what point

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0group the x terms together f(x) = (2x^2 +12x)+ 5 now remove the common factor of 2 \[f(x) = 2(x^2  6x) + 5\] what is needed inside the brackets to complete the square

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0the vertex is a maximum since the coefficient of the leading term is 2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Maximum at (3,5) Minimum at (3,5) Maximum at (3,23) Minimum at (3,23) those are my options btw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 @Michele_Laino

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0so what do you need to add inside the brackets to get a perfect square..?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@mathway @mathgenious

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i really have no idea what im doing @campbell_st

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Or you can do this. dw:1438893714666:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do it and I'll tell you if you got it right. And if you won't, then I'm not the right person to ask for help. (:

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0@mathway, whilst your method is valid, it doesn't address the question of using complete the square. I would have solved this question is the way you suggested... But I think the question is asking for specific skills.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@campbell_st I agree that the question asked him to specifically solve it by completing the square; I just thought that it would be easier for him to do what I said. Nevertheless, he didn't respond to what we told him to do to solve it.
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