Question

equações exponenciais, calcule:​

Answer 1

Resposta:

a).2^×=1282^×=2^7×=7

b).3^×+=813^×+2=3^4×+2=4×+2-2=4-2×=4-2×=2

c).5^×-1=15^×-1=5^0×-1=0×-1+1×=0+1×=0+1×1.

semoga bermanfaat

Answer 2

a)2^x=128

2^x=2^7

x=7

b)3^x+2=81

3^x+2=3^4

x+2=4

x+2-2=4-2

x=4-2

x=2

c)5^x-1=1

5^x-1=5^0

x-1=0

x-1+1=0+1

x=0+1

x=1

d)2^x+1=1024

2^x+1=2^10

x+1=10

x+1-1=10-1

x=10-1

x=9

e)5^3x-5=625

5^3x-5=5^4

3x-5=4

3x-5+5=4+5

3x=4+5

3x=9

3x÷3=9÷3

x=9÷3

x=3

f)81^x=243

(3^4)^x

3^4x

então 3^4x=243

3^4x=3^5

4x=5

4x÷4=5÷4

x=5÷4

x=1,25

g)6^x+5=216

6^x+5=6^3

x+5=3

x+5-5=3- 5

x=3-5

x=-2

h)16=4^x+2

4^2=4^x+2

2=x+2

0=x

x=0

Espero ter ajudado!