solve it ( 7a+7b) * (5a - 5b)
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( 7a + 7b ) ( 5a - 5b )
=> 7( a + b ) { 5( a - b ) }
=> ( 7 × 5 ) { ( a + b ) ( a - b )}
=> ( 35 ) ( a^2 - b^2 )
=> 35( a^2 - b^2 )
Or, 35a^2 - 35b^2
=> 7( a + b ) { 5( a - b ) }
=> ( 7 × 5 ) { ( a + b ) ( a - b )}
=> ( 35 ) ( a^2 - b^2 )
=> 35( a^2 - b^2 )
Or, 35a^2 - 35b^2
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