Question

Resolva as equações do 2° grau:

a. x² - 5x + 6 = 0
b. x² - 8x +`12 = 0
c. x² + 2x - 8 = 0
d. 2x² - 8x + 8 = 0

Answer 1

a)

1x²-5x+6=0

∆=(b)²+(-4)*(a)*(c)

∆=(-5)²+(-4)*(1)*(6)

∆=25-24

∆=1

x=(-b ±√∆)/2a

x=(-(-5)±√1)/2

x=(5±1)/2

x'= (5+1)/2→ x'=3

x"=(5-1)/2→ x"=2

S = {3;2}