Question

Equação de 2 grau x2-3x-4=0. /x2-x-6=0

Answer 1

Olá.

x² - 3.x - 4 = 0 
x² - 3.x = 4 
x² - 3.x + 9/4 = 4 + 9/4 
( x - 3/2 )² = 25/4 
x - 3/2 = √ (25/4) 
x - 3/2 = ± 5/2 
x = 3/2 ± 5/2 
x = ( 3 ± 5 ) / 2 
x = { -1 , 4 } 
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x²-x-6=0
a=1 b= -1 c= -6

-b+/- √b²-4*a*c/2a

-1+/- √(-1)²-4*1*-6/2

-1 +/- √-24