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(x + 4)/4x = 1/(x + 2)
(x + 4)(x + 2) = 4x
x² + 6x + 8 - 4x = 0
x² + 2x + 8 = 0
x₁,₂ = (-2 ± √(4 - 4(1)(8)) / 2
= (-2 ± √-28) / 2
x₁ = (-2 + √-28)/2 atau x₂ = (-2 - √-28)/2
p² - 10p + 25 = 0
(p - 5)² = 0
p = 5
x² - 2px - p - 1 = 0
Real dan kembar syarat D = 0
(-2p)² - 4(1)(p - 1) = 0
4p² - 4p + 4 = 0
p² - p + 1 = 0
x₁,₂ = (1 ± √(1 - 4)) / 2