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b) 4x² - y² = (2x + y) (2x - y)
c) x² - 1 = (x + 1) (x - 1)
d) a⁴ - 16 = (a² + 4) (a² - 4)
= (a² + 4) (a + 2) (a - 2)
e) p⁴ - q⁴ = (p² + q²) (p² - q²)
= (p² + q²) (p + q) (p - q)
f) (2x + 1)² - (2x - 1) = (4x² + 2x + 1) - (2x - 1)
= 4x² + 2x + 1 - 2x + 1
= 4x² + 2
= 2 (2x² + 1)
g) (m + n)² = m² + 2mn + n²
semoga membantu ya :)