Question

Determine o valor de x

Answer 1

Vamos lá

a) 4x = 5*9

x = 45/4

b) x*2x = 2*9

x^2 = 9 , x = 3

c)  9x = 8*11

x = 88/9

d) x*x = x + 12

x^2 - x - 12 = 0

d^2 = 1 + 48 = 49, d = 7

x = (1 + 7)/2 = 8/2 = 4