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a) 16 + 8x + x² = x² + 8x + 16
= (x² + 4x) + (4x + 16)
= x(x + 4) + 4(x + 4)
= (x + 4)(x + 4)
b) 36 - 20x + x² = x² - 20x + 36
= (x² - 18x) + (-2x + 36)
= x(x + 18) - 2(x - 18)
= (x - 2)(x - 18)
c) a² - 13ab + 36b² = (a² - 9ab) + (-4ab + 36b²)
= a(a - 9b) - 4b(a - 9b)
= (a - 4b)(a - 9b)
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