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= 8²a² - 3²
= (8a)² - 3²
= (8a - 3) × (8a + 3)
17. 8a² - 2b²
= 2(4a² - b²)
= 2(2²a² - b²)
= 2( (2a)² - b²)
= 2(2a - b) × (2a + b)
18. 25p² - 16q²
= 5²p² - 4²q²
= (5p)² - (4q)²
= (5p - 4q) × (5p + 4q)
19. 36x² - 81y²
= 9(4x² - 9y²)
= 9(2²x² - 3² y²)
= 9( (2x)² - (3y)² ) kurung pertama dan kurung terakhir besar
= 9(2x - 3y) × (2x + 3y)
20. 81p² - 100q²
= 9²p² - 10²q²
= (9p)² - (10q)²
= (9p - 10q) × (9p + 10q)
semoga anda puas ☺
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