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b) c² - 49d² = (c + 7d)(c - 7d)
c) -x² + 81 = (9 + x)(9 - x)
d) 16x² - 5 = (4x + √5)(4x - √5)
e) x² - 2 = (x + √2)(x - √2)
f) 2 - y² = (√2 + y)(√2 - y)
g) m² - 16n² = (m + 4n)(m - 4n)
h) 3 - 25a² = (√3 + 5a)(√3 - 5a)
i) 25 + 16x²
j) x³ + 8 = x³ + 2³ = (x + 2)(x² - 2x + 4)
k) 27a³ - 8 = (3a)³ - 2³ = (3a - 2)(9a² 6a + 4)