Question

Factorise:- 4x² -12xy- 25+9y²​

Answer 1

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$\longrightarrow \sf {4x}^{2} - 12xy - 25 + {9y}^{2} \\ \\ \longrightarrow \sf {(2x)}^{2} - 2(2x)( 3y )- {(5)}^{2} + {(3y)}^{2} \\ \\\longrightarrow \sf {(2x)}^{2} - 2 (2x ) (3y) + {(3y)}^{2}- {(5)}^{2} \\ \\\longrightarrow \sf {(2x - 3y)}^{2} - {(5)}^{2}$