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mathtard
 4 years ago
Find the vertex
f(x)= 3x^218x+3
please help me. Awards will be given
mathtard
 4 years ago
Find the vertex f(x)= 3x^218x+3 please help me. Awards will be given

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satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1use the all mighty formula \[x= \frac{b}{2a}\] to find the first coordinate

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1in this case \[a=3,b=18\] so \[\frac{b}{2a}=\frac{18}{2\times3}=3\]

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1that is the first coordinate and the second coordinate is what you get when you replace x by 3. you get \[3\times 3^218\times 3+3=2754+3=27+3=24\] check my arithmetic because it is late

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1also because i didn't really compute. as soon as i saw 27 i knew the next one would be 54. always works that way

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1vertex is (3,24) unless i messed up

mathtard
 4 years ago
Best ResponseYou've already chosen the best response.0so (3,24) ? and that would make it a maximum right?

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1this is a parabola that faces up. no max, but a min

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1dw:1314675140476:dw

satellite73
 4 years ago
Best ResponseYou've already chosen the best response.1the minimum value is 24

mathtard
 4 years ago
Best ResponseYou've already chosen the best response.0I always do that with the minimum maximum.
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