Question

x²-x-12=0 qual e a resposta??

Answer 1

x² - x - 12 = 0

Δ = b² - 4.a.c

Δ = -1² - 4 . 1 . -12

Δ = 1 - 4. 1 . -12

Δ = 49

Há 2 raízes reais.

x = (-b +- √Δ)/2a

x' = (--1 + √49)/2.1

x'' = (--1 - √49)/2.1

x' = 8 / 2

x'' = -6 / 2

x' = 4

x'' = -3

S = {-3, 4}