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1) 9x² - 5xy - 4x²y + 7y²
koefisien x² = 9
koefisien x²y = - 4
( A)

2) ( 7x² + 2x - 13 ) + ( 24 - 2x - 9x² )
= 7x² - 9x² + 2x - 2x - 13 + 24
= - 2x² + 11 ( B )

3) ( 2p + 6 ) - ( -6p - 4 )
= 2p + 6p + 6 + 4
= 8p + 10 ( D )

4) ( 2x - 1 )( 3x + 4 )
= 6x² - 3x + 8x - 4
= 6x² + 5x - 4 ( A )

5) 6x^8y^6 ÷ 3x²y
= 2x^6y^5 ( D)

6) ( 4p - 5q)²
= 16p² - 40pq + 25q² ( D )