Question

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Answer 1

$a = \sqrt{25 {x}^{6} } = 5 {x}^{3}$

$b = \sqrt[3]{ { - x}^{9} } = { - x}^{3}$

$a + b = (5 {x}^{3} ) + ( { - x}^{3} ) = 4 {x}^{3}$