Question

Simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5

Answer 1

A

Explanation:

`(x + y)(a - b) = xa - xb + ya - yb`

(√5+4)(√5-2) =

=
`( {√(5))}^(2) - 2 √(5) + 4 √(5) - 8`

=
`5+ 2 √(5) - 8`

=
`- 3+ 2 √(5)`

Hope this helps ^-^