Răspuns :
1. x²+7x+10 = x²+2x+5x+10
x²+7x+10 = x²+7x+10
0 = 0
2. 20 -16V2+15V2-12V4 = 20- V2 - 12*2 = 20-V2 - 24 = -4 - V2
3. 5x(4x²-y²) = 5x(2x-y)(2x+y)
4. cred ca e incompleta cerinta
1. x²+7x+10 = x²+2x+5x+10
x²+7x+10 = x²+7x+10
0 = 0
2. 20 -16V2+15V2-12V4 = 20- V2 - 12*2 = 20-V2 - 24 = -4 - V2
3. 5x(4x²-y²) = 5x(2x-y)(2x+y)
4. cred ca e incompleta cerinta