a. (2x + 3) * (X - 5) = x(2x + 3) - 5(2x + 3) = 2x^2 + 3x - 10x - 14 = 2x^2 - 7x - 15
b. (2x + 3) + (X - 5) = 3x - 2
c. (2x + 3) - ( x - 5) = 2x + 3 - X + 5 = x+ 8
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