Question

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(1) -(5x+y)-3(2x-3y) (2) 5(a+b)-4(3a-2b)+3(2a+3b) (3) 3a²-2(5a²-ab+b²)-3(7ab-7b²-3a²)

Answer 1

(1)-(5x+y)-3(2x-3y)
=-5x-y-6x+9y
=-11x+8y

(2) 5(a+b)-4(3a-2b)+3(2a+3b)
=5a+5b-12a+8b+6a+9b
=5a-12a+6a+5b+8b+9b
=-a+22b

(3) 3a²-2(5a²-ab+b²)-3(7ab-7b²-3a²)
= 3a²-10a²+2ab-2b²-21ab+21b²+9a²
=3a²-10a²+9a²+2ab-21ab-2b²+21b²
=2a²-19ab+19b²

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Answer 2

(1) -(5x+y)-3(2x-3y)
=-5x-y-6x+9y
=-11x+8y

(2) 5(a+b)-4(3a-2b)+3(2a+3b)
=5a+5b-12a+8b+6a+9b
=-a+22b
(3) 3a²-2(5a²-ab+b²)-3(7ab-7b²-3a²)
=3a²-10a²+2ab-2b²-21ab+21b²+9a²
=2a²-19ab+19b²