Question

Resolva as equações exponenciais ( 2°grau ):
a) 36x – 6x = 0
b) 25x – 5x = 0
c) 4x – 10 . 2x + 25 = 0
d) 4x – 8 . 2x = – 12
e) 4x – 9x + 20 = 0
f) 49x – 13 . 7x + 42 = 0
g) 36x – 5 . 6x + 2 = 0

Answer 1

Essas equações são do 1º grau.

A) 36x-6x=0
30x=0
x=0

B) 25x-5x=0
20x=0
x=0

C) 4x-8.2x+25=0
4x-16x+25=0
25=12x
25/12=x

D) 4x-8.2x=-12
4x-16x=-12 (-1)
12x=12
x=1

E) 4x-9x+20=0
-5x+20=0
20=5x
x=20/5
x=4

F) 49x-13.7x+42=0
49x-91x+42=0
-42x+42=0
42=42x
x=1

G) 36x-5.6x+2=0
36x-30x+2=0
6x=-2x=-2/6
x=-1/3