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Persamaan Kuadrat
SMP Kelas VIII

Bentuk Umum
ax² + bx + c = 0

x² - 2x + 3 = 0
a = 1
b = -2
c = 3

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

x₁.x₂ = c/a
        = 3/1
        = 3

x₁² + x₂² = (x₁ + x₂)² - 2.x₁.x₂
              = (2)² - 2(3)
              = 4 - 6
              = -2
[B]