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2) (B)
3) 2(3x + 2y) - 4(x - 5y)
= 6x + 4y - 4x + 20y
= 2x + 24y (B)
4) 8x - 4 - 6x + 7
= 8x - 6x - 4 + 7
= -2x + 3 (B)
5) 2p²r - pq
= 2×(2)²×5 - 2(-3)
= 40 + 6
= 46 (B)
6) (2x - 3)²
= 4x² - 12x + 9 (B)