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7. 6x²+5xy-6y² =
6x²+9xy-4xy-6y² =
3x(2x+3y)-2y(2x+3y) = (3x-2y)(2x+3y)
8. (3a-2b)(4a-b) =
12a²-3ab-8ab+2b² = 12a²-11ab+2b²
= 16m^2 - 28m + 28 m - 49
= 16m^2 - 49
7. d. (2x + 3y)(3x - 2y)
= 6x^2 - 4xy +9xy - 6y^2
= 6x^2 + 5XY - 6y^2
8. (3a - 2b)(4a - b)
= 12a^2 - 3ab - 8ab +2b^2
= 12a^2 - 11ab + 2b^2. (c)