tolong jawab pertanyaanku :)

| A | = x(x + 1) - ( (x + 1)(-4) )= -4
x² + x - ( -4x - 4 ) = -4
x² + x + 4x + 4 = -4
x² + 5x + 8 = 0

x₁ + x₂ = -5
x₁•x₂ = 8

x₁² + x₂² = (x₁ + x₂)² - 2x₁•x₂
=>(-5)² - 2(8)
=>25 - 16
=>9