4 / x^2 - a^2 / b^2
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Note that 4 is 2²
Then if you have x and y as : x²/y², you can say that it is equal to (x/y)²
& finally, use the x²-y² factorisation
Originally Posted by stellina_91 Factorise:
4 / x^2 - a^2 / b^2 .
Factorise using the difference of perfect squares formula.
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