20-12-2018
Mathematics

contestada

13. Solve –5√ x = –15. A. x = –9 B. x = –7 C. x = 9 D. x = 7

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21-12-2018

[tex]Domain:x\geq0\\\\-5\sqrt{x}=-15\qquad\text{divide both sides by (-5)}\\\\\sqrt{x}=3\to \boxed{x=9}\to\boxed{C.}[/tex]

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