Question

помогите решать геометрию​

Answer 1

6

$x(2-x)+x^{2} =4\\2x- x^{2} +x^{2} =4\\2x=4\\x=4:2\\x=2$

7

$-(x-4)*(x+3)+x*(x+3)=3x-7\\(x+3)*(-x+4+x)=3x-7\\(x+3)*4=3x-7\\4x-12=3x-7\\4x-3x=-7-12\\x=-19$

8

$(x+3)(3-x)-x(2+x)+2x^{2} =9-x^{2} -2x-x^{2} +2x^{2} =9-2x$

Якщо х=-10

$9-2*(-10)=9+20=29$