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a] 2a(a + 4b) = 2a² + 8ab
b] 1/2 (4x - 6y) = 2x - 3y
nomor 2
a] (2x - 3)(x + 5) = 2x² + 7x - 15
b] (3x - y)(x + y) = 3x² + 2xy - y²
c] (a + 3b)(2a - 4b) = 2a² + 2ab - 12b²
d] (5 + a)(7 - a) = 35 + 2a - a²