Question

9x ao quadrado+12x-5=0

Answer 1

b2 - 4ac
12.12 - 4.9. (-5)
144 + 180 = 324

-b +- rz(b2-4ac) / 2a
-12 +- 18 / 18

x1 = -12 + 18/18 = 1/3
x2 = -12 - 18/18 = - 5/3

Answer 2

9x² + 12x - 5 = 0

A= 9

B= 12

C= - 5

∆= b² - 4ac

∆= 12² - 4 • 9 • ( - 5)

∆= 144 + 180

∆= 324

x= - b ± √∆ / 2a

x= - 12 ± √324 / 2 • 9

x'= - 12 + 18/18 = 6/18 = 1/3

x''= - 12 - 18/18 = - 30/18 = - 5/3

S= (1/3 , - 5/3)