Tolong dibantu jawab ya teman teman no 10:)

x² - 2x + 5 = 0

a = 1
b = -2
c = 5

x₁ + x₂ = -b/a
           = - (-2) / 1
           = 2

x₁ . x₂ = c/a
          = 5 / 1
          = 5

x₁² + x₂² = (x₁ + x₂)² - 2.x₁.x₂
              = 2² - 2(5)
              = 4 - 10
              = -6

Jawaban C

x²-2x+5 = 0
=>x1+x2= -b/a
=-(-2)/1
=2