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1.)
(a+3b)(2a-4b)
= 2a² - 4ab + 6ab - 12b²
= 2a² + 2ab - 12b²
2.)
(-3 - p)(5+p)
= -15 - 3p - 5p - p²
= -p² - 8p - 15
3.)
(5+a)(7-a)
= 35 - 5a + 7a - a²
= 35 + 2a - a²
4.)
(a+ab+b)(a-b)
= a² - ab + a²b - ab² + ab - b²
= a² + a²b - ab² - b²
5.)
(x²+3x-5)(x²-2x-1)
= x⁴ - 2x³ - x² + 3x³ - 6x² - 3x - 5x² + 10x + 5
= x⁴ + x³ - 12x² + 7x + 5
6.)
2xy(x-3y)
= 2x²y - 6xy²
7.)
5a(3ab - 2ac)
= 15a²b - 10a²c
8.)
3y(4xy - 4yz)
= 12xy² - 12y²z