Решите уравнения;а)7x+3x=2x^2+3x+3 б)-7x^2=0 в)x^2-7x+10=0 г)2a^2-a=3 д)y^2-10y+25=0

[latex]7x+3x=2x^2+3x+3[/latex] [latex]7x+3x-2x^2-3x-3=0[/latex] [latex]-2x^2+7x-3=0[/latex] [latex](-1)(-2x^2+7x-3)=0[/latex] [latex]2x^2-7x+3=0[/latex] [latex] \sqrt{D} = \sqrt{b^2-4ac} [/latex] [latex]b=-7[/latex] [latex]a=2[/latex] [latex]c=3[/latex] [latex] \sqrt{D} = \sqrt{49-24} = \sqrt{25} =5 [/latex] [latex]x_{1}= \frac{-b+ \sqrt{D} }{2a} = \frac{12}{4} =3[/latex] [latex]x_{2}= \frac{-b- \sqrt{D} }{2a} = \frac{1}{2} [/latex] [latex]-7x^2=0[/latex] x=0 [latex]x^2-7x+10=0[/latex] x1=5 x2=2 a1=3 a2=-2 y1=-5