Question

Find the quadratic function y=ax^2+bx+c whose graph passes through the given points:
(1,1),(3,-17),(-2,13)

Answer 1

i am not sure but maybe you can solve for this system of equations

1=a+b+c
-17=a3^2+b3+c
13=a*-2^2+b*-2+c

Answer 2

i really do appreciate you hun :) i've been working on this problem for over 30 minutes before I decided to post it

Answer 3

? how do you solve it from here...I am so lost

Answer 4

well this one is messy. solve a in eq 1
plug it into eq 2
solve for b in eq 2

plug it into eq 3

Answer 5

a=-1 b=-5 c = 7

Answer 6

y=ax^2+bx+c but its supposed to look like this...
y=-x^2-5x+7?

Answer 7

y=ax^2+bx+c

y=-1*x^2-5*x+7

so yes that is the answer :D

Answer 8

:D you are a life saver hun!!

Answer 9

:D not yet see if it is right Hope it is :)

Answer 10

i really like you, you're so helpful! :) it was right, its an online class with immediate feedback haha

Answer 11

well so long as you know how that got done :)

Answer 12

um...what if the numbers change...
(-1,-8),(1,-2),(-3,2)

Answer 13

you lost me...sorry :/

Answer 14

make a system of equations again

-8=a*(-8)^2+b*(-1)+c, -2=a+b+c, 2=a*(-3)^2+b*(-3)+c

Answer 15

they're fractions.... ? now i'm really confused

Answer 16

http://hitcalc.com/calc_data/draw_data/cache/f576bf252673b81dde5231c2528c3f3a.png

Answer 17

it doesn't matter just plug them in :)

Answer 18

ha, can i ask how old you are....you're helping me with college algebra and this class is constantly going over my head...

Answer 19

y=(-8/59)*x^2+(-75/59)*x+(-35/59)

Answer 20

I am too old :P lol

Answer 21

26

Answer 22

[-8=a*(-1)^2+b*(-1)+c, -2=a+b+c, 2=a*(-3)^2+b*(-3)+c]...one number off...It kept saying it was incorrect...i understand where you put the numbers and why!!...ok, maybe I'm too excited about that but *sigh*, you up for another one :)

Answer 23

sure

Answer 24

how many chances you get to get it right :P

Answer 25

3...i had already used one and then i entered the fractions so i had to get it right the third time, you definitely got me closer then what i had in the first try :)

Answer 26

was y=(-8/59)*x^2+(-75/59)*x+(-35/59) correct?

Answer 27

sometimes computers are picky

-(8/59)*x^2-(75/59)*x-35/59 that might work Unless i did something completly wrong

Answer 28

[-8=a*(-1)^2+b*(-1)+c, -2=a+b+c, 2=a*(-3)^2+b*(-3)+c] this one was...you had put -8 here ^

Answer 29

ha oops the first -1

Answer 30

oh yes sorry i made mistake there

Answer 31

its not a problem, that is the ONLY mistake you made...in my book, that's pretty dang good hun :)

Answer 32

(-1,-8),(1,-2),(-3,2)
-8=a*(-1)+b*(-1)+c, -2=a+b+c, 2=(-3)*a+(-3)*b+c

Answer 33

still getting error grr lol

Answer 34

did you put the [ ] thingys around it?

Answer 35

yes when i paste to the website

Answer 36

ooh i know :)

Answer 37

forgot to square :P

Answer 38

and it still gives you an error...

Answer 39

ha glad you figured it out...we'd be here all night if you were counting on me finding the error...sometimes i hate being dyslexic

Answer 40

(-1,-8),(1,-2),(-3,2)
-8=a*(-1)^2+b*(-1)+c, -2=a+b+c, 2=(-3)^2*a+(-3)*b+c

Answer 41

:D

Answer 42

oh men I need glasses not the smae but it sucks :P looking at a lot of numbers and messy equations :P

Answer 43

http://hitcalc.com/calc_data/draw_data/cache/f05d01e3768cebd52b8d0d7ddeecfff3.png

Answer 44

now the solution looks cute :D

by that i mean nice integers :P

Answer 45

I have glasses too...i just never wear them...nicely done hun!

Answer 46

and I mean same not smae :P

Answer 47

its all good, in some ways being dyslexic helps me decode things too :) hahaha

Answer 48

I am myopic

Answer 49

that is awesome :)

I suck at spelling. Maybe my fingers are dyslexic.

Answer 50

I always switch letters.

maybe it has to do more with me being mexican and that I try to spell things in spanish at times.

Answer 51

haha, i never thought of that, i dont know what my vision is called, i can see about to the hood of my car...and the rest is really blurry...nearsidedness ha :)

Answer 52

myopic is near sighted :)

idk what far sighted is lol.

Answer 53

oh...haha wow, i feel smarter already :P <--this sir..is a legit face

Answer 54

This website will make you feel smarter :P

Answer 55

ha fer sure... :)

Answer 56

better than FB :P

Answer 57

fer sure, you throw a ball straight up from a rooftop. the ball misses the rooftop on its way down and eventually strikes the ground. a mathematical model can be used to describe the relationship for the ball's height above the ground, y, after x, seconds.