rozwiąż równanie 2x³-7x²=0 -3x³+8x²+x=0 x³+x²-2x-2=0

2x³-7x²=0 x²(2x-7)=0 x²=0 ==> x=0 2x-7=0 ==>2x=7 ==> x=7/2 -3x³+8x²+x=0 x(-3x²+8x+1)=0 x=0 -3x²+8x+1=0 Δ=8²-4*(-3)=64+12=76=4*19 √Δ=2√19 x₁=(-8-2√19)/(-6)=-2*(4+√19)/(-2)*3=(4+√19)/3 x₂=(-8+2√19)/(-6)=-2*(4-√19)/(-2)*3=(4-√19)/3 x³+x²-2x-2=0 x²(x+1)-2(x+1)=0 (x²-2)*(x+1)=0 x+1=0 ==> x=-1 x²-2=0 ==> x²=2 ==>x=√2 i x=-√2