Question

Help, please see picture, and explain: no decimals please,​

Answer 1

`- √(72) = - \sqrt{2 {}^(3) * 3 {}^(2) } = - 2 * 3 √(2) = - 6 √(2)`

`- 4 √(8) = - 4 \sqrt{2 {}^(3) } = - 4 * 2 √(2) = - 8 √(2)`

`- √(72) - 4 √(8) = - 6 √(2) - 8 √(2) = - 14 √(2)`