Answer
$x+2x^{\frac{1}{2}}-15$
Work Step by Step
Simplify. $(x^{\frac{1}{2}}-3)(x^{\frac{1}{2}}+5)$
Thus,
$=x^{\frac{1}{2}}x^{\frac{1}{2}}+5x^{\frac{1}{2}}-3x^{\frac{1}{2}}-15$
or, $=x^{\frac{2}{2}}+2x^{\frac{1}{2}}-15$
or, $=x+2x^{\frac{1}{2}}-15$
