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= -5p²q + 2pq² - 3pq² + 5p - 2q + q
= -5p²q - pq² + 5p - q
2) 3 (2m + n) + 2 (5m - 4n)
= (3 × 2m) (3 × n) (2 × 5m) (2 × -4n)
= 6m + 3n + 10m - 8n
= 6m + 10m - 3n - 8n
= 16m - 11n
3) Dik.
a = 2y + 3x² - xy
b = x² + 2xy - 3y
3a - 2b
= 3(2y + 3x² - xy) -2(x + 2xy - 3y )
= (3 × 2y) (3 × 3x²) (3 × -xy) (-2 × x) (-2 × 2xy) (-2 × -3y)
= 6y + 9x² - 3xy - 2x - 4xy + 6y
= 9x² - 2x + 6y + 6y - 3xy - 4xy
= 9x² - 2x + 12y - 7xy