(a - b)² = a² - 2ab + b²
(x² + 2)² - 4(x² + 2) + 4 = (x² + 2)² - 2*2*(x² + 2) + 2² = (x² + 2 - 2)² = x⁴ = x*x*x*x
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(a - b)² = a² - 2ab + b²
(x² + 2)² - 4(x² + 2) + 4 = (x² + 2)² - 2*2*(x² + 2) + 2² = (x² + 2 - 2)² = x⁴ = x*x*x*x