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= 5x + 8y
b) 2a + 3b = 4x + 6y + 9x + 15y
= 13x + 21y
c) ab = 6x² + 10xy + 9xy + 15y²
= 6x² + 19xy + 15y²
d) a² = (2x + 3y)²
= 4x² + 12xy + 9y²