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(3x - 4y) (3x + 4y)
3x(3x) + 3x(-4y) + 4y(3x) + 4y(-4y)
9x² - 16y²
No. 8
(3x - 5y) (3x + 5y)
3x(3x) + 3x(-5y) + 5y(3x) + 5y(-5y)
9x² - 25y²
No. 9
(6x - 2y) (6x + 2y)
6x(6x) + 6x(-2y) + 2y(6x) + 2y(-2y)
9x² - 16y²
Semangat belajar.. ^_^