Question

I need help with number 5 please

Answer 1

4
`√(14)`

Explanation:

Using the rule of radicals

`√(a)` ×
`√(b)` ⇔
`√(ab)`

Simplify radicals, that is

`√(56)`

=
`√(4(14))`

=
`√(4)` ×
`√(14)` = 2
`√(14)`

`√(126)`

=
`√(9(14))`

=
`√(9)` ×
`√(14)` = 3
`√(14)`

Then

`√(56)` -
`√(14)` +
`√(126)`

= 2
`√(14)` -
`√(14)` + 3
`√(14)`

= 4
`√(14)`

Answer 2

The answer is the second one 4 √14