1. 9a²+3b-7b²-12a²+6ab+2b²
= 9a^2 - 12a^2 + 3b - 7b^2 + 2b^2 + 6ab
= -4a^2 + 3b - 5b^2 + 6ab
2. (2x-3) (x+5)
= 2x . x + 2x . 5 - 3 . x - 3 . 5
= 2x^2 + 10x - 3x - 15
= 2x^2 + 7x - 15
3. 2(12-4)+5x=34
=> 24 - 8 + 5x = 34
=> 16 + 5x = 34
=> 5x = 34 - 16
=> 5x = 18
=> x = 18/5 = 3 3/5
Semoga bisa membantu mohon maaf kalau salah
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1. 9a²+3b-7b²-12a²+6ab+2b²
= 9a^2 - 12a^2 + 3b - 7b^2 + 2b^2 + 6ab
= -4a^2 + 3b - 5b^2 + 6ab
2. (2x-3) (x+5)
= 2x . x + 2x . 5 - 3 . x - 3 . 5
= 2x^2 + 10x - 3x - 15
= 2x^2 + 7x - 15
3. 2(12-4)+5x=34
=> 24 - 8 + 5x = 34
=> 16 + 5x = 34
=> 5x = 34 - 16
=> 5x = 18
=> x = 18/5 = 3 3/5
Semoga bisa membantu mohon maaf kalau salah