(x-3)(x+3)-x(x+6)>3x

问题描述:

(x-3)(x+3)-x(x+6)>3x

(x-3)(x+3)-x(x+6)>3x
x²-9-x²-6x>3x
3x+6x<-9
9x<-9
x<-1

(x-3)(x+3)-x(x+6)>3x
x^2-9-x^2-6x>3x
9>9x
x