Question

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√(-9)-(-25) × [ (-6)² ÷ (+3)² ]²

Answer 1

             $\sqrt{(-9)-(-25)} x[(-6)^2:(+3)^2]^2 \\ \\ = \sqrt{-9+25} x[36:9}]^2 \\ \\ = \sqrt{16} x[4}]^2 \\ \\ =4x16 \\ \\ =64$