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= y2 + 2x - 1
b) 6x - 4y2 + z - 2x + y2 - 3z
= 4x - 3y2 - 2z
c) 3(x - y2 + 2) -5 (2x + 3y2 - 2)
= 3x - 3y2 + 6 - 10x - 15y2 + 10
= -7x - 18y2 + 16
2. a) 2x + 4y - 2xy + 10x - 15y + 25xy
= 12x - 11y + 23xy
b) (2x + 5) - (x - 3)
= 2x2 + 6x - 5x + 15
= 2x2 + x + 15
c) -2p3 + 4pq - 2q2 + 3p3 + 12pq - 3q2
= 5p3 + 16pq - 5q2
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