Question

Nomer 4 dan 5 pleasee

Answer 1

Bab Eksponensial
Matematika SMP Kelas IX

(4/5) (2³ˣ ⁻ ²) + 8ˣ / 20 = 1
**dikali 20**
16 (2³ˣ . 2⁻²) + 2³ˣ = 20
4 . 2³ˣ + 2³ˣ = 20
5 . 2³ˣ = 20
2³ˣ = 20/5
2³ˣ = 1/4
2³ˣ = 2⁻²
3x = - 2
x = -2/3

jawabannya B

5] 4^(x + 1) + 2^y = 20
2^y = 20 - 4^(x + 1) 

2^(x - 1) - 2^y = -3
2^y = 2^(x - 1) + 3

2^y = 2^y
2^(x - 1) + 3 = 20 - 4^(x + 1)
2ˣ . 1/2 + 4ˣ . 4 = 20 - 3
**dikali 2**

2ˣ + 2²ˣ . 8 = 34
8 . 2²ˣ + 2ˣ - 34 = 0
8a² + a - 34 = 0
(8a + 17) (a - 2) = 0
8a + 17 = 0 atau a - 2 = 0
a = -17/8             a = 2

2ˣ = 2
x = 1

2^y = 2^(x - 1) + 3
2^y = 2^(1 - 1) + 3
2^y = 2⁰ + 3
2^y = 4
2^y = 2²
y = 2

x + y = 1 + 2 
x + y = 3

jawabannya D