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⇒ ( √a² + √25b² ) ( √a² - √25b² )
⇒ ( a + 5b ) ( a - 5b )
⇔ x² - 9y²
⇒ ( √x² + √9y² ) ( √x² - √9y² )
⇒ ( x + 3y ) ( x - 3y )
⇔ 36x² - 144
⇒ ( √36x² + √144 ) ( √36x² - √144 )
⇒ ( 6x + 12 ) ( 6x - 12 )