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4) =6ar-9a
5) =-14ab+28
6) =-15x³+40x²-25x
7) =12x³-2x²-24x-18x²+3x+36
=12x³-2x²-18x²-24x+3x+36
=12x³-20x²-21x+36
8) = 4r⁴
maaf kalau salah
2. ab × (-2pq) × (-3rs) = 6abpqrs
3. 2(m + 2n) = 2m + 4n
4. 3a(2r - 3) = 6ar - 9a
5. -7a(2b - 4) = -14ab + 28a
6. -5x(3x² - 8x + 5) = -15x³ + 40x² - 25x
7. (2x - 3) (6x² - x - 12) = 12x³ - 2x² - 24x - 18x² + 3x + 36
= 12x³ - 20x² - 21x + 36
8. (-2r²)² = (-2r²) (-2r²)
= 4r⁴
jadikan menjadi jawaban terbaik!