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2. 9x² - 16 = ( 3x - 4)(3x + 4)
3. a² - 4b² = ( a - 2b)(a + 2b)
4. 25p² - 16p² = 9p²
5. 16x^4 - 81y^4 = (4x² - 9y²)(4x² + 9y²)
6. 2m^4 - 16n^4 = 2(m^4 - 8n^4)
7. (m - n) pangkat - 1 = 1 per (m - n)
8. 25x² - 9(p + q)² = 25x² - 9(p² + 2pq + q²)
= 25x² - 9p² -18pq - 9q²
9. (3x +y)² - (x + y)²
= 9x² + 6xy + y² - ( x² + 2xy + y²)
= 9x² + 6xy + y² - x² - 2xy - y²
= 8x² + 4xy
10. 4(x - y)² - (x + y)²
= 4( x² - 2xy + y²) - (x² + 2xy + y²)
= 4x² - 8xy + 4y² - x² - 2xy - y²
= 3x² - 10xy + 3y²