Question

urgenteee

2 x²-x-16-16​

Answer 1

Resposta:

S = { -4; 5}

Explicação passo a passo:

Answer 2

Resposta:

2ˣ²⁻ˣ⁻¹⁶ = 16

2ˣ²⁻ˣ⁻¹⁶ = 2⁴

x² - x - 16 = 4

x² - x - 16 - 4 = 0

x² - x -20 = 0

Δ = b² - 4ac

Δ = (-1)² - 4 . 1 . (-20)

Δ = 1 + 80

Δ = 81

$x = \frac{-(-1)+-\sqrt{81} }{2 . 1}$

$x = \frac{1+-9}{2}$

$x' = \frac{1-9}{2}$

$x' = \frac{-8}{2}$

$x' = -4$

$x" = \frac{1+9}{2}$

$x" = \frac{10}{2}$

$x" = 5$

S = {-4, 5}