g(x)=X^2-1
Find the x and y intercept

Question

anonymous · Answer

do you mean g(X)=x^2-1 ???

awesome781 · Answer

oh yes sorry

solomonzelman · Answer

$\large\color{blue}{ \rm  g(x)=x^2-1 }$  

$\large\color{blue}{ \rm  HINT:~~~~~~~~~~~~~~~x^2-1=(x-1)(x+1) }$

anonymous · Answer

1 and -1

awesome781 · Answer

oh so i had to factor it to get my x and y?

anonymous · Answer

you would factor it and then set each factor, (x-1) and (x+1) equal to zero to find your x-intercept

awesome781 · Answer

oh ok thanks for the help :)

solomonzelman · Answer

Have you learned about imaginary numbers (such as ` i ` ) ?

awesome781 · Answer

i have a question is this question same thing when written as (x^2-1) in parenthesis?

solomonzelman · Answer

Well, when you write  ` 3-1 ` , and  ` (3-1) ` the meaning is the same.

THe difference would be between

$\large\color{blue}{ \rm f(x)=x^2-1 }$     and     $\large\color{blue}{ \rm f(x)=(x-1)^2 }$

awesome781 · Answer

yes but my teacher said we are not messing with imaginary numbers yet

solomonzelman · Answer

cool. I am just saying that if you had a plus instead of minus, in    $\large\color{blue}{ \rm f(x)=x^2-1 }$    you would need imag.  .....

awesome781 · Answer

oh ok thanks again :)

solomonzelman · Answer

Anytime :)