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## Homework Statement

Im doing functions, and graphing functions. Here is the question:

Find the X intercepts, and Y intercepts of

f(x) 2x^2 - x -1

## Homework Equations

## The Attempt at a Solution

So first finding the X intercepts, the first thing I do, is change it to:

f(x) = 0 so,

2x^2 - x -1 = 0

Now the book takes the above, and changes it to:

(2x+1)(x-1) = 0 (How do you get this <---, from 2x^2 - x -1 = 0 )

Then it goes,

x = -1/2, x = 1

So the X intercepts are (-1/2,0) and (1,0)

Any help would be great!

P.S: Can you work this out on a graphing calculator? Just curious...

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