Answer:
20x^2+19x-60
Explanation:
3x(4x+5)-4(-x-3)(2x-5)
12x^2+15x+(4x+12)(2x-5)
12x^2+15x+8x^2-20x+24x-60
= 20x^2+19x-60
6.5m questions
8.7m answers