Question

Determine as raízes da equação 4x − 3 · 2x+1 + 8 = 0. Dica, 2x = y.

Answer 1

Resposta:

4x-3.2x+1+8=0

4x-6x+1+8=0

-2x = -9

x = -9/2 . (-1)

x = 4,5

y = x² -9x +20

2x = x² -9x +20

11x = x² + 20

x = (11 + √41) / 2, (11 - √41) / 2