2006-09-25 09:32:18 · 3 answers · asked by C.T. 2 in Education & Reference ➔ Higher Education (University +)
I keep coming up with the vertex of (1,-9) and the x intercept of -8. If you can walk me through how you came about your anserws that would be great- Thanks!
2006-09-25 09:55:23 · update #1
Do you have to show work on your homework? having us give you the answer may not work.
2006-09-25 09:34:05 · answer #1 · answered by Baby #1 born August 2009 6 · 0⤊ 0⤋
y intercept is when the x = 0, so sub 0 to x and you'll get it. same thing applies to the x intercept. As to the vertex, the formula is (-b/2a, VD/4a)
ax^2+bx+c
D = B^2-4ac
V<< square root
2006-09-25 16:36:03 · answer #2 · answered by sylvdoanx 2 · 0⤊ 0⤋
y intercept is found when x = 0
ie f(x) = 8
x intercept when y = 0
0 = x^2 - 2x -8
0 = (x-4)(x+2)
so x = 4, x = -2
2006-09-25 16:38:09 · answer #3 · answered by JuJu 3 · 0⤊ 0⤋