Simplify:
` {sqrt a +sqrt x}/{sqrt a - sqrt x}`

Simplify : (\sqrt 5 - \sqrt 3)/(\sqrt 3 + \sqrt 5) \times (\sqrt 5 - \sqrt 3)/(\sqrt 3 -\sqrt 5)

Simplify: (sqrt 3 - sqrt 5)(sqrt 5+ sqrt 3)

Simplify: (\sqrt 5+\sqrt 3)/(\sqrt 5 - \sqrt 3)\times (\sqrt 5+\sqrt 3)/(\sqrt 5 +\sqrt 3)

Simplify: sqrt(3-2sqrt(2))

Simplify: 1/(sqrt5 + sqrt4) + 1/(sqrt4 + sqrt3) + 1/(sqrt3 + sqrt2) + 1/(sqrt2 + sqrt1)

Simplify : sqrt(3+2sqrt(2))

Simplify: (3+sqrt 3)(3-sqrt3)

Simplify: sqrt(-20) + sqrt(-12)

Simplify: sqrt(-4) + sqrt(-16)- sqrt(-25)

Simplify {(\sqrt 5+\sqrt 3)\times (\sqrt 5 - \sqrt 3)}/(\sqrt 7- \sqrt 3)\times (\sqrt 7+ \sqrt 3)/(\sqrt 7+\sqrt 3)