x intercepts

- anonymous

x intercepts

- schrodinger

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- anonymous

whats the question your asking

- anonymous

identify the x-intercepts in the graph y = 3x2 + 19x – 40..sorry connection was slow

- anonymous

The Def'n of the x-intercept is the points where the y-value is zero. So set y to 0 and solve for x

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## More answers

- precal

use the quadratic formula

- jennychan12

quadratic formula:
\[x = \frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

- anonymous

Quadratic formula for 0 = ax^2 + bx + c\[x= {-b \pm \sqrt{b^2-4ac} \over 2a}\]

- anonymous

thank you guys.. but how do I do that?

- precal

are you studying algebra 1 or 2?

- anonymous

2

- precal

|dw:1357172313426:dw|just sub into formula and use order of operation to evaluate it

- anonymous

This can also be factored if you are well versed at factoring

- precal

you could also, find the roots by looking at the graph of the function

- anonymous

thankyou precal. (:

- anonymous

\[0=3x^2 + 19x – 40\]\[0=(3x-5)(x+8)\]

- precal

you have many choices for finding the solution, if you plan to study math beyond algebra 2 learn to factor (but not everything can be factored), learn to use the quadratic formula (works 100% of the time)

- anonymous

im horrible in math, so after alg 2 i will be done with it :P

- precal

everything in math (no matter the power) gets written to the 1st power or the 2nd power, so learn to solve those

- precal

what will you do in the future? future goals?

- precal

|dw:1357172585393:dw|

- anonymous

im going to own a buisness but i already everything i would need too know. its not going to be huge or complex..just a simple small town business

- precal

|dw:1357172654731:dw|

- precal

|dw:1357172718818:dw|

- precal

well math teaches us to be patient and to pay attention to details

- precal

in business, you will care about maximizing your profit and minimizing your cost
all big businesses started small and grew
higher math helps you expand your business
watch shark tank, pay attention to when they talk about numbers
many people do not get funding because they do not know their numbers
some good ideas were passed up by the sharks
some bad ideas were given money because the people knew their numbers
good luck
don't give up on math yet

- anonymous

im givin different answers on this question. im confused which one is wrong or right?

- precal

Solutions are the same x=-8 and x=5/3
I just showed that if you use the quadratic formula or factoring, you will get the same solutions.

- anonymous

I wont give up on math, i mean as I have to use it ill start to learn it..in real life situations i guess.
and ooohhkk. thankyou (:

- precal

yw

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