l² – 16l + 64
Factorise
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l² - 16l + 64
=> l² + ( 8 + 8 )l + 64
. .
=> l² + 8l + 8l + 64
=> l( l + 8 ) + 8( l + 8 )
=> ( l + 8 ) ( l + 8 )
=> l² + ( 8 + 8 )l + 64
. .
=> l² + 8l + 8l + 64
=> l( l + 8 ) + 8( l + 8 )
=> ( l + 8 ) ( l + 8 )
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