tolong jawab soal uraian no 1,2,3,4,5. dengan cara!

1.
f(x) = x³ - 9x + mx + 69
f(3) = 12
27-27 + 3m + 69 = 12
m = - 19

g(x)= x⁴ + 2x³ - 2x + nx + 26
g(-2) = 12
16 - 16 + 4 - 2n + 26 = 12
n = 9

m+n = -19 + 9 = -10

2.
g(x-2) = 2x + 3
g(x)= 2(x+2) + 3
g(x)= 2x + 7
h{ g(x)} =  6x + 23
h(2x+7) = 6x + 23
h(x) = 6[ 1/2 (x-7)] + 23
h(x) = 3(x-7) + 23
h(x) = 3x -21 + 23
h(x) = 3x + 2

3. lim x->∞ √(x²+2x) - √(x²+x)
a=p = 1
b = 2, q = 1
limit = b- q/(2√a) = (2-1)/2√1)  = 1/2

4.limit x->0 [ xᵃ. sin⁴ x]/[ sin⁶ x] = 1
xᵃ/sin² x . sin⁴ x/sin⁴ x = 1
xᵃ/sin² x = 1
a= 2