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2*2 + 3*(-2) = 4 + (-6) = 4 - 6 = -2
b) 2x^2 - 3y + 4
2*(2)^2 - 3*1,5 + 4 = 2*4 - 4,5 + 4 = 8 - 4,5 + 4 = 3,5 + 4 = 7,5
c)