The mathematical expression in the image is: \[ (\sqrt{-4x})(\sqrt{-5x}) \] This expression involves the multiplication of two square roots. Each square root contains a negative number multiplied by the variable \(x\). To simplify this expression, you can apply the property of square roots that states \(\sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b}\). Therefore, multiplying inside the square roots gives: \[ \sqrt{(-4x) \cdot (-5x)} = \sqrt{20x^2} \] This can be further simplified to: \[ \sqrt{20} \cdot x \] Finally, \(\sqrt{20}\) can be expressed as \(2\sqrt{5}\), so the fully simplified form is: \[ 2x\sqrt{5} \]

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