Question

find the turning point of y=2x^2+4x+3 i knoiw that y=3

Answer 1

plug in y=3, and solve for x

Answer 2

ah so simple

Answer 3

i really stuffed up can you tell me what the turning point is cos i dont know if the teacher made a mistake'

Answer 4

hmm, i don't feel like solving this equation, so i'll use a shortcut which u'll learn in calculus 1:
4x+4=0
x=1

Answer 5

wait y is not 3 btw, when x is 1:
y = 2+4+3=9

Answer 6

i got y by making x =0

Answer 7

well the turning point is:
(1,9)

Answer 8

well if ur right the teacher is wong he recons it is -1,1

Answer 9

can't be. Plot and see.

Answer 10

i will

Answer 11

wait a sec, ur teacher's right.

Answer 12

oh h

Answer 13

how

Answer 14

i made a mistake:
4x+4=0,
x=-1

Answer 15

ti will try complete the square

Answer 16

Up there I wrote:
4x+4=0
x=1,
x is -1, not 1

Answer 17

k

Answer 18

http://www.wolframalpha.com/input/?i=Plot+%28y%3D2x%5E2%2B4x%2B3%29

Answer 19

i did it on my cas calculator and it says that it is -1,1

Answer 20

yes that's right

Answer 21

cos i dont know calculus i will try and solve it some way else

Answer 22

ey i just use x=-b/2a

Answer 23

whatever i do i wlways get y=3

Answer 24

i got x=-1 sub that in and it makes y=3

Answer 25

no when x=-1 y is not 3. Let's see
2x^2+4x+3
2*1 - 4 + 3 = 5 - 4 = 1

Answer 26

ur a geneous i was taking 2x^2 as me having to square the 2 aswell

Answer 27

I'm not a genius (facepalm) lol

Answer 28

dont be modest