2x(5x-y)-x(8x-2y) 3a(2b+4)+2a(3-5b)
2x(5x-y)-x(8x-2y)=10x^2-2xy-8x^2+2xy=2x^2
3a(2b+4)+2a(3-5b)=6ab+12a+6a-10ab=18a-4ab