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( a² - b² ) = ( a - b ) . ( a + b )
Entonces:
( x + 5 ) . ( x – 5 ) – ( x – 6 ) . ( x + 6 )
( x² - 5² ) - ( x² - 6² )
x² - 25 - ( x² - 36 )
x² - 25 - x² + 36 = 11 → Solución
×^2-25-(×^2-36)
X^2- 25-X^2+36
=11