Question

Tlg hari cpt, nnti insya Allah djdiin jwbn trbk

Answer 1

Eksponen

•

2^x + 2^(x + 3) = 72

(2^x)(1 + 2^3) = 72

2^x . 9 = 72

2^x = 8

x = 3 ✔

••

3^x + 3^(x + 2) = 90

(3^x)(1 + 3²) = 90

3^x . 10 = 90

3^x = 9

x = 2 ✔

•••

4^(x + 1) + 2^(2x) = 20

4^(x + 1) + 4^x = 20

(4^x)(4¹ + 1) = 20

(4^x)(5) = 20

4^x = 4

x = 1 ✔

Answer 2

Jawaban:

a. x=3

2^x + 2^x+3=72

2^3 + 2^3+3=72

8 + 2^6=72

8 + 64=72

72=72

b. x=2

3^x + 3^x+2=90

3^2 + 3^2+2=90

9 + 3^4=90

9 + 81=90

90=90

c. x=1

4^x+1 + 2^2x=20

4^1+1 + 2^2(1)=20

4^2 + 2^2 =20

16 + 4 =20

20 = 20

Keterangan:

→"^" artinya pangkat

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