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b. (a+b)² = ((-2) + (-3))² = (-2-3)² = (-5)² = 25
c. (b+c)^9 = (-3+4)^9 = 1^9 =1
b) {-2+(-3)}² = -5²= 25
c) (-3+4)⁹ = 1⁹ = 1