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= 2a + a + 3b - 2b
= 3a + b
b) 7x - 3y + 4
2a) 6(-a) × 2b
= (-6)a × 2b
= -12ab
b) (-3)p × 2pq × (-4)r
= -6p²q × (-4)r
= 24p²qr
3a) 12a : (-3a)
= (-4)
b) a²b³ ÷ (ab)²
= a²b³ ÷ (a² + 2ab + b²)
= b / 2ab
= ½b
4) (3a²)²
= 3² + 2.3.a² + (a²)²
= 9 + 6a² + a⁴
b) -(2a)²
= -(2² + 2.2.a + a²)
= - 4 - 4a - a²
c) (-3a²)³
= (-3a²)²(-3a²)
= (9-6a²+a⁴)(-3a²)
= -18a² + 18a⁴ - 3a^6