1.(2x+3) (8x-4) 2.(2a+b) (2a-b) 3.(3a+4) (5a-2b+c) jawaab makasih yaa

1.
= (2x + 3) (8x - 4)
= 16x² -8x + 24x -12
= 16x² + 16x -12

2.
= (2a + b) (2a -b)
= 4a² -2ab +2ab -b²
= 4a² -b²

3.
= (3a + 4) (5a -2b + c)
= 15a² -6ab + 3ac + 20a -8b + 4c
= 15a² + 20a -8b + 4c -6ab + 3ac

1. 16x^2-8x+24x-12
2. (2a)^2-b^2=4a^2-b^2
3. 15a^2-60a+3ac+20a-80+4c
=15a^2-40^2+3ac-80+4c