1. 4(a+3b)+2(a-4b) = 4a+12b+2a-8b = 6a+4b
6a+4b = 6*0,5 + 4*(-3) = 3-12 = -9
2. -2(x²+y)-3(4y-2x²) = -2x²-2y-12y+6x² = 4x²-14y
4x²-14y = 4*(-2)² - 14*(-4) = 4*4 + 56 = 16+56 = 72
