1. Factorise the following

Factorise the following:
 
1. \(4x^2 - 20x + 25 =\)
 
2. \(\frac{y^2}{9} - 9 =\)
Answer variants:
\((2x - 5)\)
\(\left(\frac{y}{9} + 9 \right)\left(\frac{y}{9} - 9 \right)\)
\(\left(\frac{y}{3} + 3 \right)\left(\frac{y}{3} - 3 \right)\)
\((2x - 5)^2\)
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