Question

What is the quadratic function that is created with roots -3 and 1 and a vertex at (-1, -8)?

Answer 1

srry roots r the x values rite

Answer 2

so we would model this in vertex form

Answer 3

lets go over this together

Answer 4

ill wait till u reply

Answer 5

r u there

Answer 6

tsunamiiii reply

Answer 7

yes

Answer 8

ok so do u remember vertex form.

Answer 9

what wud the equation be

Answer 10

f (x) = a(x - h)2 + k ?

Answer 11

yeah

Answer 12

i mean.. y equals a brackets x minus h... etc

Answer 13

so it called vertex form for a reason.. (h,k) is the coordinate of the vertex

Answer 14

so youd insert that in the equation . y = a(x+1)2 - 8

Answer 15

u can insert a coordinate into the equation and solve for a

Answer 16

because u already have the (-3,0) and (1,0) , u can sub that into the equation i wrote and solve for the a value

Answer 17

so try this: 0 = a(1+1)2 - 8

Answer 18

do u understnad so far

Answer 19

yes

Answer 20

ok tell me what u get as your answer

Answer 21

u got it..