Question

a) 18x - 43 =65
b)23x - 16 = 14 - 17x
c)10x - 5 ( 1 + x ) = 3 ( 2x - 2) - 20
d)4x ( x + 6 ) - x2 = 5x2

Answer 1

a) 18x=43+65= 108
18x=108
x=108/18
x=6

b)23x+17x=14+16
40x=30
x=30/40
x=0,75

c)10x-5-5x=6x-6-20
10x-5x-6x=-20-6+5
-x=-21
x=21

d)4x (x + 6) - x² = 5x² 
4x² + 24x - x² = 5x² 
5x² - 4x² + x² - 24x = 0 
2x² - 24x = 0 
x² - 12x = 0 
x.(x - 12) = 0 

x' = 0 <= a resposta 

x" - 12 = 0 
x" = 12 <= a resposta


ESPERO TER AJUDADO :)