Question

Can you check my answer?
Based on the graph of y = x2 − 2x − 3, what is the x coordinate of the positive x-intercept?

x = -b/2*a
x = 2/2*1
x = 2/2 = 1

So would the answer be 1? It's not multiple choice so I can't be sure.

Answer 1

yes the answer should be one .

Answer 2

x-intercept means, y=0
so, we get
\[0=x^2-2x-3\\
(x-3)(x+1)=0\\
\mathbf{x=3}\qquad{\rm OR}\qquad\mathbf{x=-1}
\]
so, what is the positive "x-intercept"?

Answer 3

oh, so the answer would be 3?