1) 14x-2 - (4x²-1)=14x-2-4x²+1=14x-1-4x²
2) 4x²-9-(4x²+4x-5x-5)=4x²-9-4x²-4x+5x+5=x-4
3) 16x²-40x-(8x+6)=16x²-40x-8x-6=16x²-48x-6
4) 16x²-49-(4x²-25)=16x²-49-4x²+25=12x²-24
1) 14x-2 - (4x²-1)=14x-2-4x²+1=14x-1-4x²
2) 4x²-9-(4x²+4x-5x-5)=4x²-9-4x²-4x+5x+5=x-4
3) 16x²-40x-(8x+6)=16x²-40x-8x-6=16x²-48x-6
4) 16x²-49-(4x²-25)=16x²-49-4x²+25=12x²-24