Question

Simplify this question

Answer 1

$3 + \sqrt{ - 12} \\ = 3 + \sqrt{ 2 \times 2 \times - 3} \\ = 3 + 2 \sqrt{ - 3}$

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer 2

$\\ \sf\longmapsto 3+√-12$

$\\ \sf\longmapsto 3+√12i$

$\\ \sf\longmapsto 3+√2(2)(3)i$

$\\ \sf\longmapsto 3+2√3i$