a) x^2-4x-12=0 (ec de gradul 2) calculezi delta si apoi x1, x2 asa procedezi la toate sper ca te-am ajutat cat de cat...

a) x²-4x=12x²-4x-12=0 Δ=16+48=64 x₁=(4-8)/8=-4/8=-1/2 x₂=(4+8)/8=12/8==3/2 b)4x²+12x=16 4x²+12x-16=0     :4 x²+3x-4=0 Δ=9+16=25 x₁=(-3+5)/2=2/2=1 x₂=(-3-5)/2=-8/2=-4 c)9x²-6x=120 9x²-6x-120=0      :3 3x²-2x-40=0 Δ=4+480=484 x₁=(2-22)/6=-20/6=-10/3 x₂=(2+22)/6=24/6=4 d)x²+10x=24 x²+10x-24=0 Δ=100+96=196 x₁=(-10+14)/2=4/2=2 x₂=(-10-14)/2=-24/2=-12