Question

√45 + √80 - √105

Answer 1

\(=\sqrt{9.5}+\sqrt{16.5}-\sqrt{105}\\ =3\sqrt{5}+4\sqrt{5}-\sqrt{105}\\ =7\sqrt{5}-\sqrt{105}\)

Answer 2

\(=3\sqrt{5}+4\sqrt{5}-\sqrt{105}=7\sqrt{5}-\sqrt{105}\)