Question

можете решить ..............

Answer 1

1)2x+9=x*(x+2)
2x+9-x^2-2x=0
x^2-9=0
x=±3
2)x^2-36=5x
x^2-5x-36=0
D=(-5)^2-(-36)*4=25+144=169
x1=(5+13):2=9
x2=(5-13):2=-4