1. Choose the correct simplification of the expression - 5x2 (4x - 6x2 - 3).
30x4 - 20x3 + 15x2
-11x4 - x3 - 8x2
-30x4 + 20x3 - 15x2
30x4 + 20x3 + 15x2
2. Simplify (6x2 - 3 + 5x3) - (4x3 - 2x2 - 16).
2x3 - x2 + 21
-2x3 + x2 - 21
x3 + 8x2 + 13
-x3 - 8x2 + 13
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