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b) 2a^2 - 3b^2 - 2ab= 2*3^2 - 3*(-3)^2 - 2*3*(-3)= 18 - 27 + 18 = (-9)+18 = 9
c) m^2 - 2n - 4mn = (-3)^2 - 2*(-4) - 4*(-3)*(-4)= 9 + 8 + 48 = 17 + 48 = 65
d) x^3 +3xy - 4y = (-2)^3 + 3*(-2)*5 - 4*5 = (-8) + (-30) - 20 = (-38) - 20 =(-58)
e) 2k - 4s + 2kt - 3ks = 2*(-3) - 4*(-4) + 2*(-3)*3 - 3*(-3)*(-4)= (-6) + 16 + (-18) -36 = 10 -54 = (-44)