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Mathematics Taco:

Find the x and y intercepts

1 year ago Taco:

$f(x) = \frac{ x^2 + 2x + 1 }{ 3x^2 + 3 }$

1 year ago Taco:

this one looks scary if im honest

1 year ago Hero:

Okay, so to help you out, as you know the basic equation for a function on an xy plane is $$y = f(x)$$ so we can just replace $$f(x)$$ with $$y$$ to make it less scary: $y = \frac{ x^2 + 2x + 1 }{ 3x^2 + 3 }$

1 year ago Taco:

okay

1 year ago Taco:

i wrote that down

1 year ago Hero:

Usually, to find the x-intercept, you set y = 0, then solve for $$x$$. To find the y-intercept, you set x = 0, then solve for $$y$$

1 year ago Taco:

x = -1?

1 year ago Hero:

How'd you get that? Mind showing your steps?

1 year ago Taco:

so for x it would look like $0 = \frac{ x^2 + 2x + 1 }{ 3x^2 + 3 }$ $0 = \frac{ (x +1)(x + 1) }{ 3(x^2 + 1) }$ it was here where I realized I didnt need to care about the bottom x = -1

1 year ago Taco:

and the x+1 is x =-1 for zero

1 year ago Hero:

First, never assume you don't need to count anything. But as it turns out, there is only one $$x$$ intercept in this case.

1 year ago Hero:

Which is indeed $$x = -1$$

1 year ago Taco:

for y I did$y = \frac{ 0^2 + 2(0) + 1 }{ 3(0)^2 + 3 } = \frac{ 1 }{ 3 }$

1 year ago Hero:

Very good. They are both correct. Great job.

1 year ago Taco:

thank you

1 year ago
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