tolong di jawab yg saya lingkarin makasih

1. 7×a×4b×5a= 7a×5a×4b= 35a^2 × 4b= 140a^2b

4. 8xz × 3y^2 z × (-4x^2 y)
= 24xy^2 z^2 × (-4x^2 y)
= -96x^3 y^3 z^2

6. -6mx^2 × 2xy^2 × (-4my) × (-5m^2 xy^2)
= -12mx^3 y^2 × 20m^3 xy^3
= -240m^4 x^4 y^5

8. 2a(7a^2 + 4b)= 14a^3 + 8ab

9. -5p^2 (6p-3q)= -30p^3 + 15p^2 q

12. 5m^2 (2m^2 + 8m^2 n -5mn^2)
= 10m^4 + 60m^4 n - 25m^3 n^2

13.
A. 2(5x+1+3x)= 2(8x+1)= 16x+2
B. 2x+2y+4+4x+1+3y= 6x+5y+5

14. (x+4)(x+15)= x^2 + 15x + 4x + 60= x^2 + 19x + 60

16.(4x+3)(5x-2)= 20x^2 - 8x + 15x - 6= 20x^2 + 7x - 6

17. (8-5x)(9-5x)= 72 - 40x - 45x + 25x^2= 72 - 85x + 25x^2

Maaf klo salah, trims :)