(square root of 5u + 6square root of v)^2
Not sure how to type this but it's all in parentheses and it's all squared.
5u under square root, 6 outside square root, v underneath square root
25u + 36v + 36u√v + 36v√u
(√(5u) + 6√v)^2
= (√(5u))^2 + 2√(5u) * 6√v + (6√v)^2
= 5u + 12√(5uv) + 36v