Ребята помогите плис срочно!!! (2x-1).(5x+2)=0 6 класс

(2x-1)*(5x+2)=0 [latex] 10x^{2} [/latex]+4x-5x-2=0 [latex] 10x^{2} [/latex]-x-2=0 D=[latex] (-1)^{2} [/latex]-4*10*(-2)=1+80=81=[latex] 9^{2} [/latex] [latex] x_{1} [/latex]=[latex] \frac{1+9}{2*10} [/latex]=[latex] \frac{10}{20} [/latex]=[latex] \frac{1}{2} [/latex]=0.5 [latex] x_{2} [/latex]=[latex] \frac{1-9}{2*10} [/latex]=[latex] \frac{8}{20} [/latex]=[latex] \frac{2}{5} [/latex]

[latex](2x-1)(5x+2)=0\\2x-1=0\\2x=1\\x=1:2\\x=0.5\\\\5x+2=0\\5x=-2\\x=-2:5\\x=-0.4[/latex]