Question

How do I graph y = x(x - 4)

Answer 1

first find x intercept then y intercept

Answer 2

x = 4, y = -4

Answer 3

put y = 0 and then solve for x

what do you get @deehthebee ?

Answer 4

well the parabola is concave down and has x intercepts at 0 and 4

the line of symmetry is x = 2 and the minimum value occurs when x = 2... substitute to find that value.

find the y- intercept by letting x = 0...

Answer 5

y=x(x-4)

put y = 0

0 = x(x-4)

x = 0 or x = 4

put x = 0 now

y= 0

Answer 6

What do you mean?

Answer 7

@mathslover

Answer 8

what I meant is what campbell explained

Answer 9

I don't really get it. Can you explain it again please?

Answer 10

oh k no problem i will do

Answer 11

y = x(x-4)

put y = 0 first..
solve for x what do you get?

Answer 12

y = 0, x = 4

Answer 13

right can x also be 0 ?

Answer 14

I don't think so?

Answer 15

why

0 = x(x-4)

divide both sides by x-4

0/(x-4) = x(x-4)/(x-4)
0 = x

Answer 16

Oh I see. So how would I draw this then?

Answer 17

first of all the line of symetry x = 2

u can continue now

Answer 18

I've never heard of that. What do you mean?

Answer 19

every parabola is symmetrical...

Answer 20

But are you saying that it has to go through x = 2?

Answer 21

@mathslover

Answer 22

Hello?

Answer 23

@mathslover i think someone's calling you for the last quarter of an hour

Answer 24

Yes I have lol

Answer 25

maybe @mathslover didnt know the next step so he quit? :p haha lol

Answer 26

Strange because mathslover has viewed the thread a few times but never responded

Answer 27

Yay I am getting a response!

Answer 28

seems my reverse psych worked

Answer 29

Well, I was getting a response...

Answer 30

I am typing wait

Answer 31

OK :)

Answer 32

sorry for giving late response but wait for my response

Answer 33

mathslover is not typing a reply


I am typing it in notepad will copy paste it .. please don't think -ve

Answer 34

my work here is done

Answer 35

here i go