Question

2+12x=9x² alguém pode me ajudar com essa conta?

Answer 1

2 + 12x = 9x²

-9x² + 12x + 2 = 0

a = -9 b = 12 c = 2

Δ = b²-4ac

Δ = 12² - 4.(-9).2

Δ = 144 + 72 = 216

x = -b ± √Δ/2a

x = -12 ± √216/2.12

x = -12 ± 6√6/24

x' = -12 ± 6√6/24 (÷6) = ( -2 - √6/4)

Answer 2

2 + 12x = 9x²

- 9x² + 12x + 2 = 0

∆= b² - 4ac

∆= 12² - 4 • ( -9) • 2

∆= 144 + 72

∆= 216

x= - b ± √∆ / 2a

x= - 12 ± √216 / 2 • ( - 9)

x'= - 12 + √216 / - 18

x''= - 12 - √216 / - 18