Question

Plz help me with it !

Answer 1

Answer:
`\bold{-7+2√(14)+5√(7)-10√(2)}`

Explanation:

`(\sqrt7-5)/(\sqrt7+\sqrt8)\bigg((\sqrt7-\sqrt8)/(\sqrt7-\sqrt8)\bigg)=(7-2√(14)-5√(7)+10\sqrt2)/(7-8)=(7-2√(14)-5√(7)+10\sqrt2)/(-1)\\\\\\=\boxed{-7+2√(14)+5√(7)-10\sqrt2}`