Question

solve the quadratic equation. x^2-3x=4

Answer 1

x^2 - 3x - 4 = 0
factor it.

Answer 2

We first need to set it up in the form \(ax^2+bx+c=0\)

Answer 3

Well ya like @shamil98 has shown we subtract 4 from both sides to achieve this

Answer 4

Ok I got that. I have x^2-3x-4=0 but I am not sure where to go from there.

Answer 5

you can use the quadratic formula
or just factor it to
(x+b)(x-b) form. and then solve for (x+b)=0 and (x-b) = 0 to get your solutions

Answer 6

We need to find 2 numbers that when you add them they equal -3 and when you multiply them they equal -4

Answer 7

Well that would be -4 and 1.

Answer 8

correct.

Answer 9

Correct

Answer 10

so, in
(x+b)(x-b)=0
form it would be?

Answer 11

So basically then we replace -3x with -4x +1x

Answer 12

So our equation would look as follows
\(x^2-4x+1x-4\)

Answer 13

(x-4)(x+1) = 0
after you put it in that form
x - 4 = 0
and
x + 1 = 0
solve for x to get your solutions.

Answer 14

Then we group the first 2 terms and teh last 2 terms
\( (x^2-4x)+(x-4)=0

Answer 15

\( (x^2-4x)+(x-4)=0\)

Answer 16

Then we factor out from each bracket
x(x-4)+1(x-4)=0

Answer 17

You made a mistake I believe.. @swissgirl

Answer 18

At which point?

Answer 19

Well, she is asking how to find the solution, I have no idea what you are showing..
the original equation is x^2 - 3x - 4.
factored out
(x-4)(x+1)= 0
x = -1
x =4

Answer 20

x^2 - 4x + x -4
can just be simplified to
x^2 -3x - 4
.....

Answer 21

Yes but I am just demonstrating how you factored it out
This is the typical way it is taught in school and when it becomes more challenging then it is imperative that you write it out in this fashion

Answer 22

@Katelynmorris which method are you familiar with?

Answer 23

It looks more complicated with your method
x^2 -3x -4
you know that the values are 1 and - 4.
just put that like this
(x-4)(x+1) = 0

Answer 24

I am lost after the x^2-4x+1x-4=0..Solving by factoring

Answer 25

But @shamil98 it works this time but what happens if the equation was \(3x^2-3x-4=0\) ?

Answer 26

Ok so after the (x-4)(x+1)=0 that gives me x how?

Answer 27

listen to sham, he got da plan @_@

Answer 28

(x-4)(x+1)=0
you put
x-4=0
and x+1=0
to get your solutions .

Answer 29

@Katelynmorris just look at daht smart score of his @_@ YO SWISS, DONT BE CHEESY <3 I loe u, but let L do his Justice <3

Answer 30

3x2−3x−4=0
swiss, i would use the quadratic formula. instead of trying to factor it.

Answer 31

You can use whtvr it makes no diff as long as you get your answer

Answer 32

Your method is much more complicated than it needs to be, just make it simple..

Answer 33

The only reason why I was showing him that method since that is the method taught in schools

Answer 34

Plus your method wont work for complicated equations trust me kid

Answer 35

Ok so x= 4, -1?

Answer 36

Yes, those are your solutions.

Answer 37

Thanks.

Answer 38

as a drunk person on peaches, let me tell u somethin swiss cheese, sham aint no kid, he be Justice @_@

Answer 39

don't make me get my peaches loe <3 @Katelynmorris listen to sham, hes been doin dis for years @_@ just look at daht bronze 76 he got @_@

Answer 40

every time you type @_@ you tag whoever that is lol

Answer 41

LAWL XD

Answer 42

OMG THEY ACTUALLY EXCIST o-o

Answer 43

I have been using that face for so many times like this.........they will witness the spam of there lives when they come back XD

Answer 44

stalking profile now

Answer 45

XD