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2. 10x²-35xy-6xy+21y²
10x² - 41xy + 21y²
3. 27x²-6x-72x+16
27x² - 78x + 16
2. (5x-3y) (2x-7y) = -10x* - 35xy - 6xy + 21y*
= -10x* - 41xy + 21y*
3. (3x-8)(9x-2) = 27x* - 6x-72x+16
= 27x*-78x+16