Question

where does the graph of y=2x2-x-3 cross as the x-axis?

Answer 1

Hi ivogel3 :)

How are you dear ? :D

Answer 2

good

Answer 3

So we have to find the point on x-axis, known as x-intercept also. Right?

Answer 4

yes i need to answers

Answer 5

Well we know at x-axis the coordinate of y is 0
And at y-axis the coordinate of x is 0.

OK dear.

Answer 6

ok

Answer 7

So in order to find x-intercept we have to put y=0

Answer 8

if the equation is already equal to zero then what

Answer 9

Your equation becomes.
\[\large x^2-x-3=0\]
Now solve it.

Answer 10

Then just solve it simply.

Answer 11

(x )(x ) but is other number that goes into the parenthasses

Answer 12

I know you can solve it now. You must get 2 answers.

Answer 13

what about the 2

Answer 14

Do you know how to use the quadratic formula?

Answer 15

\(\huge x= \frac{-b \pm \sqrt{b^2-4ac}}{2a}\) Where \(a=2;~~b=-1;~~c=-3\)

Answer 16

\(\huge x= \frac{-(-1) \pm \sqrt{(-1)^2-4(2)(-3)}}{2(2)}\)

Answer 17

\(\huge x= \frac{1 \pm \sqrt{1+24}}{4}=\frac{1\pm\sqrt{25}}{4}=\frac{1\pm5}{4}\)

Answer 18

X= -1 and x = 1.5

Answer 19

@dq101, please read the Code of Conduct; http://openstudy.com/code-of-conduct
Don't give out straight answers :)

Answer 20

@zepp, my bad! :$ I'm still new here!