2. Factorise II

Factorise the following using the identity \(a^2−b^2=(a+b)(a−b)\).
 
1. \(x^2-9\)
 
2. \(4x^2−25y^2\)
Answer variants:
\((x-3)(x+3)\)
\((2x+5y)(2x−5y)\)
\((2x+7y)(2x−7y)\)
\((a^2−16)(p+5)\)
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