plis darurat jawabnya pakek jalan makasih banyak

1.9a^2 -2ab+3a^2-5ab = 12a^2 -7ab
2.(2x-6)(3x+4) = 2x.3x +2x.4 -6.3x-6.4
= 6x^2 +8x-18x-24
=6x^2-10x-24
3.16x^2-1=(4x+1)(4x-1)
4.x^2-2x-48=(x-8)(x+6)
5.x^2-4/x^2-x-12 = (x-2)(x+2)/(x+3)(x-4)

1. 9a^2+3a^2-2ab-5ab
= 12a^2 - 7ab
2. 6x^2+8x-18x-24
= 6x^2-10x-24
3. 16x^2-1 = (4x+1)(4x-1)
Semoga bermanfaat. Jangan lupa jadikan jawaban terbaik.