Multiply ( 3x + 5y ) and ( 5x - 7y)
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We have :
( 3x + 5y ) × ( 5x - 7y)
= 3x × ( 5x - 7y ) + 5y × ( 5x -7y )
= ( 3x × 5x - 3x × 7y ) + ( 5y × 5x -
5y × 7y )
= ( 15x² - 21xy ) + ( 25xy - 35y² )
= 15x² - 21xy + 25xy - 35y²
= 15x² + 4xy - 35y².
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