Question

como se resolve 2x²-10x -12 =0

Answer 1

Boa noite

2x² - 10x - 12 = 0

x² - 5x - 6 = 0

(x - 6)*(x + 1) = 0

x1 = 6 
x2 = -1

Answer 2

2x² - 10x - 12 = 0

A= 2

B= - 10

C= - 12

∆= b² - 4ac

∆= ( - 10)² - 4 • 2 • ( - 12)

∆= 100 + 96

∆= 196

x= - b ± √∆ / 2a

x= - ( - 10) ± √196 / 2 • 2

x'= 10 + 14/4 = 24/4 = 6

x''= 10 - 14/4 = - 4/4 = - 1

S=( 6 , - 1)