Question

I need help with Algebra 2A IM ABOUT TO FAIL THIS CLASSSSS!!!!!!!!

Answer 1

i just need someone to walk me through this

Answer 2

when is it due because i am Algebra 2a right now

Answer 3

it's been due im just behind

Answer 4

let me see because i never did anyprojects in my class just test

Answer 5

uh i get help tyou with the last part

Answer 6

uh which part is confusing you

Answer 7

all of it

Answer 8

ok so for the last part i will give you examples

Answer 9

what is that

Answer 10

roots


tutorial.math.lamar.edu/Classes/Alg/ZeroesOfPolynomials.aspx

Answer 11

you should know what vertex is

Answer 12

Let's talk about the PDF question.

Answer 13

you are given 3 coordinates

Answer 14

and what you basically need is a formula

Answer 15

the quadratic equation is in the form ax^2 + bx + c

Answer 16

i dont know how to set it up

Answer 17

well every x coordinate we plug into the equation we should get the corresponding y

Answer 18

vertex is usully 0,0 i would help but these are resources i use and if i help toom much i would confuse me because we worked on zeroes not roots just use your scientific caculator and liik online.

Answer 19

or graphing caculator

Answer 20

yes i have it up

Answer 21

or online graphing caculaator

Answer 22

thus for (2.6, 7.9):
f(2.6) = a(2.6)^2 + 2.6b + c = 7.9

Answer 23

now you tell me the equation for the next 2 coords

Answer 24

f(4.8)=a(4.8)^2+4.8b+c=12.4
f(9.7)=a(9.7)^2+9.7b+c=15.1

Answer 25

yes very well done... now what should we do with these 3 equations to find a,b and c

Answer 26

i dont know walk me through

Answer 27

It looks like a system of equations right. You have all the information you need

Answer 28

do you know how to solve 3 equations, 3 unknowns?

Answer 29

no

Answer 30

How about 2 equations, 2 unknowns?

Answer 31

no

Answer 32

oh.. okay.. let's start with something simpler..

y=2x-1
y=4x+3

Answer 33

we have 2 strategies:
1. Elimination
2. Substitution

Answer 34

we can use both, however one is always easier than the other. depends on the equation

Answer 35

Substitution

Answer 36

yes.. since y is equal to 2x-1 and 4x+3, we can set them equal to each other

Answer 37

solve for x and then plug x back in to any of the two equations to find y

Answer 38

2x-1 = 4x+3
solving for x, we get -2

Answer 39

y=−5, x=−2

Answer 40

yes very well. in elimination we try and cancel one term by adding or subtraction

Answer 41

thus these two terms must have equal coeficcients

Answer 42

positive or negative does not matter. same magnitude

Answer 43

we

2x-1=y
-) 4x+3=y
--------------------
-2x-4=0

x=-2

Answer 44

ta da.! now in 3 equation 3 unknown, we use the same strategy:

EQUATION 1
EQUATION 2
EQUATION 3

1. EQUATION 1 +/- EQUATION 2 = EQUATION A
2. EQUATION 1 +/- EQUATION 3 = EQUATION B
3. EQUATION A +/- EQUATION B = a answer for 1 of the variables

Answer 45

do you think you can apply this to the question?

Answer 46

can you teach how to set it up

Answer 47

a(4.8)^2+4.8b+c=12.4
a(9.7)^2+9.7b+c=15.1
a(2.6)^2 + 2.6b + c = 7.9

Answer 48

try using elimination method, it will be easier in computation