Question

Qual o resultado de x ao quadrado menos 3x mais 2=0 equacao do segundo grau?

Answer 1

x² - 3x + 2 = 0

a = 1

b = -3

c = 2

Δ = b² - 4 .a . c

Δ = (-3)² -4 . 1 . 2

Δ = 9 - 8

Δ = 1

$\mathtt{\dfrac{-b+-~\sqrt{\Delta}}{2~.~a}~~´=~~\dfrac{-(-3)+-~\sqrt{1}}{2~.~1}~~=~~\dfrac{3 +-~1}{2}}} \\ \\ \\ \mathtt{x'= \dfrac{3+1}{2}~~=~~\dfrac{4}{2}~~=~~2} \\ \\ \\ \mathtt{x'' = \dfrac{3-1}{2}~~=~~\dfrac{2}{2}~~=~~1}$

Resposta: S{ 1 e 2}