Question

where does the function intersect the x-axis ?

y=x^2-2x-15

Answer 1

it will intersect the x axis when y = 0. Substitute y=0 into the equation and then solve.

Answer 2

what two numbers add up to 2 and multiply to -15 ??

Answer 3

-3 and 5

Answer 4

so..
0=(x-3)(x+5)
^x=3 ^x=-5
then 0=0

Answer 5

setting 0 for x, right ?

Answer 6

yup. So the graph intersects the x-axis at x=3 and -5

Answer 7

oh thank you so much. i understand now(:

Answer 8

No problem. Hopefully you won't stink at math anymore. lol

Answer 9

haha! thats a good one. lol