Question

Bháskara
X(ao quadrado) - 3x - 28=0

Answer 1

x² - 3x - 28 = 0

a = 1
b = -3
c = -28

Δ = (-3)² - 4*1*(-28)
Δ = 9 + 112
Δ = 121

x' = 3 + 11 / 2
x' = 14/2
x' = 7

x'' = 3 - 11 / 2
x'' = -8/2
x'' = -4

S = {7, -4}