Question

stumped...trying to figure out the y intercept for -3x^2-6x-5

Answer 1

well, since the y intercept is defined when x=0 .....

Answer 2

zero out all the x parts and what left over?

Answer 3

i got 5/3=x?

Answer 4

how? multiplying by 0 is one of the easier things to do in math

Answer 5

y = -3x^2-6x-5 ; now when x = 0 we gots..

y = -3(0)^2- 6(0) -5

y = 0 -0-5 ...

Answer 6

i got that for y but i'm trying to solve x

Answer 7

lol ....

the Y INTERCEPT is defined when:

x = 0

Answer 8

(0,5) is my Y

Answer 9

that is it

Answer 10

okay so my X intercept will be (0,0)?

Answer 11

no, thats a whole different can o worms

Answer 12

just what i was asking for.

Answer 13

amistre help me

Answer 14

X intercept is defined when y = 0 sooo

lets factor; if we can

y = -3x^2 -6x -5 = 0

-(3x^2 +6x +5) = 0

-3(x+5/3)(x+1/3) = 0 when either (x+ 5/3) = 0
or
(x+1/3) = 0

Answer 15

x = -5/3 or x = -1/3 as i see it

Answer 16

right! i got that earlier.

Answer 17

good :)

Answer 18

so now i divide -5/3 to plot on graph?

Answer 19

X=1.6

Answer 20

divide? no somehow i jumped the gun

Answer 21

http://www.wolframalpha.com/input/?i=-%283x^2+%2B6x+%2B5%29

Answer 22

there are no x intercepts since the graph never touches it

Answer 23

so i can't plug in 0 for y and get the x intercept?

Answer 24

hello