Me a parabola has a focus of f(8.5,−4) and a directrix of x=9.5. what is the equation of the parabola? 12y2+4y−1=x −12y2−4y+1=x 12y2−4y+1=x −12y2+4y−1=x

i got 142 as my answer

step-by-step explanation:

maybe i can

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!