- #1

trollcast

Gold Member

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## Homework Statement

Use the method of partial fractions to show that:

$$\frac{2x^2}{(1-x(1+x)} $$

, may be written as:

$$-2+\frac{1}{1-x}+\frac{1}{1+x}$$

, where $$\lvert x\rvert\neq1 $$.

## Homework Equations

## The Attempt at a Solution

I obviously know how to do it but in the solution am I allowed to do, let x = 1, to cancel some of the terms to figure out the constants in the partial fractions? Or do I have to do simultaneous equations by comparing the coefficients?