How to Find X in a Quadratic Equation?

[ytpj]

Homework Statement

$$\frac{2-x}{2+x}=t^3$$
How to find x?




Answer is
$$x=\frac{2-2t^3}{1+t^3}$$

 

[quasar987]

Start by multiplying both sides of the equation by (x+2).

 

[CompuChip]

$$\frac{2-x}{2+x}=t^3$$
How to find x?

Reminds me of this very old one

(but seriously, do what quasar987 told you)

 

[ytpj]

I don't understand where this leading. It still will be
$$2-x=2t^3+xt^3$$ so what?

 

[quasar987]

Then send everything on the same side of the equation so that you get

$$2-x-2t^3+xt^3=0$$

and factor the x.