Question

What is the square root of 18 plus the square root of 72?

Answer 1

`=color(blue)(9sqrt2`

Explanation:

`sqrt18 = sqrt(3*3*2) = 3sqrt2`

`sqrt(72) = sqrt(2*2*2*3*3) = 6sqrt2`

Adding,
`3sqrt2 +6sqrt2`
`=color(blue)(9sqrt2`