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= 4r²
B. (2x + 5)² = (2x + 5) (2x + 5)
4x² + 10x + 10x + 25
4x² + 20x + 25
C. (2x - 1)³ = [(2x - 1) (2x - 1)] (2x - 1)
(4x² - 2x - 2x + 1) (2x - 1)
8x³ - 4x² - 4x² + 2x - 4x² + 2x + 2x - 1
8x³ - 12x² + 6x - 1
D. (x² - 6x + 5)² = (x² - 6x + 5) (x² - 6x + 5)
= x pngkt 4 - 6x³ + 5x² - 6x³ + 36x² - 30x + 5x² - 30x + 25
= x pngkt 4 - 12x³ + 46x² - 60x + 25
E. (3m + 1/3)² = (3m + 1/3) (3m + 1/3)
9m² + 3m + 3m + 1/9
9m² + 6m + 1/9
F. (3n + 2/5)² = (3n + 2/5) (3n + 2/5)
9n² + 7,5n + 7,5n + 4/25
9n² + 15n + 4/25
semoga bermanfaat