Question

2x ao quadrado-14 x+20=0​

Answer 1

2x² - 14x + 20 = 0

a = 2

b = -14

c = 20

Δ = b² - 4.a.c

Δ = (-14)² - 4.2.20

Δ = 196 - 160

Δ = 36

-b ± √Δ / 2.a

-(-14) ± √36 / 2.2

14 ± 6 / 4

x' = 14 + 6 / 4

x' = 20 / 4

x' = 5

x'' = 14 - 6 / 4

x'' = 8 / 4

x'' = 2

S = { 5; 2 }