Răspunsuri

2014-04-20T14:56:47+03:00
9xpatrat+24x+16=4xpatrat+4x+1 9xpatrat+24x+16-4xpatrat-4x-1=0 5xpatrat+20x+15=0 5(xpatrat+4x+3)=0 xpatrat+x+3x+3=0 x(x+1)+3(x+1)=0 (x+1)(x+3)=0 x+1=0 x+3=0 x=-1 x=-3
1 5 1
2014-04-20T15:14:16+03:00
9x²+24x+16=4x²+4x+1
9x²-4x²+24x-4x+16-1=0
5x²+20x+15=0 
5(x²+4x+3)=0
x²+4x+3=0
Δ=b²-4ac
Δ=16-4·3=16-12=4
xunu=(-b+√Δ)/2a
xunu=(-4+2)/2=-2/2=-1
xdoi=(-4-2)/2=-6/2=-3
S={-1, -3}
este contul fiului meu, eu am 50 ani
glumesti, nu?
poate
nu conteaza varsta, nu ma intereseaza punctele, vreau sa ajut, atata tot si imi place matematica
totusi ce clasa esti