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tbrooks3
Group Title
Find the minimum value for the function: y = x^2 + 9x + 18
 2 years ago
 2 years ago
tbrooks3 Group Title
Find the minimum value for the function: y = x^2 + 9x + 18
 2 years ago
 2 years ago

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samjordon Group TitleBest ResponseYou've already chosen the best response.1
do u knwo how to complete the square? or do u factor it?
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
lets factor its easy
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
its under my quadratic function lesson so idk
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
what 2 numbers when you multiply them =18 and when u add them =9?
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
is there a number for that?
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
6*3=18 6+3=9
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
so is the answer 9 ?
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
yaaaa factoring i just taught this to my class today. hmmmm nooooo we r factoring. We r trying to figure out 2 numbers that when u mulyiply them give us 18 and when u add them gives us 9
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
finding the zeros is a long and complicated way to find the minimum
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
umm well we can complete the square
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
but i dont think she knows that
 2 years ago

Zarkon Group TitleBest ResponseYou've already chosen the best response.1
use the vertex formula
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
minimum is at the vertex, and first coordinate of the vertex of \[y=ax^2+bx+c\] is always \(\frac{b}{2a}\)
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
when doing the vertx thing... is the second number the minimum?
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
in your case it is \(\frac{9}{2}\) replace \(x\) by \(\frac{9}{2}\) to find the minimum
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
minimum means minimum value of \(y\) so it is the second coordinate, not the first
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
so yes, what you said, the second number is the minimum.
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
ohhh i like this method. We never learnt this stuff. Like the textbook always made us complete the square. oh cooll
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
can i just plug it into my graphing calculator to get the anwser ?
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
completing the square is for suckers, unless of course you are solving a quadratic equation
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.0
last i heard minimum value was in a calculus class o.O i never knew it was in algebra too
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
It's in Algebra 2.
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
You can use a calculator to solve it
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
hahah its in math 11 here in canada
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
\[(\frac{9}{2})^2+9\times (\frac{9}{2})+18\] then a calculator if you need one
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
you turn math up to eleven in canada? mine only goes up to ten
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
Ti84, input the equation into Y= then click 2nd Trace, and do minimum. It will say "Left bound?", go to the left side of the graph and press enter. Right bound? Obviously, right side. It will say "Guess?", which means put it to where you think the minimum y value is.
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
So for this, you get x=4.5 and y=2.25
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
sooo many numbers ... ahhhhh!!! >_< what about TI83 plus?
 2 years ago

samjordon Group TitleBest ResponseYou've already chosen the best response.1
hahaha grade 11 math lol
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.0
so taking the derivative and equating to zero is another story?
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
It'll be exactly the same basically I think.
 2 years ago

Lukecrayonz Group TitleBest ResponseYou've already chosen the best response.1
Yes lgb haha
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
they give us this freshman yr. imma senior now tryna make it up.. sucks :/
 2 years ago

tbrooks3 Group TitleBest ResponseYou've already chosen the best response.0
thanks everyone
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.4
using the derivative to find the minimum value of a quadratic. like using a glock to kill a wingspanroach
 2 years ago
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