Question

No 4 sama no5 aj plisss tq

Answer 1

No4 : e.4
no.5:d.
insya allah benar maaf klo salah jawabannya 

Answer 2

4) y = 3^x - 3^(x+1)
melalui titik A(a, -2), artinya :
-2 = 3^a - 3^(a+1)
-2 = 3^a - 3. 3^a
-2 = -2 . 3^a
3^a = 1
a = 0
melalui titik B(b, -18), artinya :
-18 = 3^b - 3^(b+1)
-18 = 3^b - 3. 3^b
-18 = - 2 . 3^b
3^b = 9
b = 2
so,
a + b = 0 + 2 = 2

5) 4/5 (2^(3x-2)) + 8^x/20 = 1
16/20  (2^3x/2^2) + 2^3x/20 = 1
4/20 (2^3x) + 2^3x/20 = 1
4. 2^3x + 2^3x = 20
5. 2^3x = 20
2^3x = 4
2^3x = 2^2
3x = 2
x = 2/3
solusi  x = 2/3