Convert to (x-h)^2=4p(y-k) form
(h,k) is vertex
p is distance from vertex to directrix and from vertex to focus
if p is negative, then it opens down (directix is above vertex and focus)
if p is positive, then it opens up (directix is below vertex and focus)
complete the square for x
y=-5(x^2-12x)-176
y=-5(x^2-12x+36-36)-176
y=-5((x-6)^2-36)-176
y=-5(x-6)^2+180-176
y=-5(x-6)^2+4
minus 4 both sides
y-4=-5(x-6)^2
divide both side by -5
(-1/5)(y-4)=(x-6)^2
(4)(-1/20)(y-4)=(x-6)^2
vertex is (6,4)
negative so opens down, directix is 1/20 units down from (6,4)
4 is up and down so 4-1/20=3.95
the directix is (6,3.95)
60% = 60/100 = 6/10 = 54/90
5/9 = 50/90
so its false because 60% smaller than 5/9
Answer:
actually both
Step-by-step explanation:
have a great day
Răspuns:
1
Explicație pas cu pas:
Fie numărul = x
x + 4 = e - - (1)
e * 4 = f - - - (2)
Ecuația 2 - 4 împărțită la 4 = 4
(f - 4) / 4 = 4
Crucea se înmulțește
f - 4 = 16
f = 16 + 4
f = 20
Rezultatul 1 împărțit la 4 este egal cu 4
Prin urmare,
e = f / 4
f = 20
e = 20/4
e = 5
De la (1)
x + 4 = e
x + 4 = 5
x = 5 - 4
x = 1
