Question

How do you evaluate `(7\sqrt { 3} + 4\sqrt { 7} ) ( 4\sqrt { 7} + 2\sqrt { 3} )`?

Answer 1

`273.15`

Explanation:

Removing the brackets,
`(7√3*4√7) + (4√7*4√7) + (2√3*7√3) + (2√3*4√7)`

`=(18√21 + 112 + 42 + 8√21)`

`=154 + 26√21`

`=273.15`