How do you simplify #\frac { x + 2} { ( x - 3) ( x + 1) } + \frac { x ( x - 2) } { 3( x - 3) } + \frac { 1- x ^ { 3} } { 3( x ^ { 2} - 2x - 3) } = - \frac { x } { 3( x + 1) }#?

Question

969 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-07-07T12:21:11

#x=7/2#

#(x+2)/((x-3)(x+1))+(x(x-2))/(3*(x-3))+(1-x^3)/(3*(x^2-2x-3))=-x/(3*(x+1))#

#(3*(x+2)+x(x-2)(x+1)+1-x^3)/(3*(x^2-2x-3))=-x/(3*(x+1))#

#(3x+6+x^3-x^2-2x+1-x^3)/(3*(x^2-2x-3))=-x/(3*(x+1))#

#(-x^2+x+7)/(3*(x^2-2x-3))=-x/(3*(x+1))#

#(-x^2+x+7)/(x^2-2x-3)=-x/(x+1)#

#-(x^2-x-7)/((x+1)*(x-3))=-x/(x+1)#

#(x^2-x-7)/((x+1)*(x-3))=x/(x+1)#

#x^2-x-7=x*(x-3)#

#x^2-x-7=x^2-3x#

#2x=7#, so #x=7/2#