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= 3x² - 36x - 4x + 48
= 3x² - 40x + 48
(a + b)² = (a + b) (a + b)
= a(a + b) + b(a + b)
= a² + ab + ab + b²
= a² + 2ab + b²
(a - b)² = (a - b) (a - b)
= a(a - b) - b(a - b)
= a² - ab - ab + b²
= a² - 2ab + b²