Question

Help with #9 please?

Answer 1

We're given a parabola


`y=x^2-4`

and a line


`y = 2x+b`

The zeros of the parabola are


`0=x^2-4`


`4=x^2`


`x=\pm 2`

We see that (-2,0) is on the line as well:


`y = 2x+b`


`0 = 2(-2)+b`


`b=4`

Choice D