Question -

→ √3(√3+√48)

Solution -

→ Multiple √3 inside the brackets

→ √ 3×3 + √ 48 ×3

→ √(3)² + √144

→ 144 is the square root of 12 i.e 12×12= 144

→ 3 + 12

→ 15

Hence 15 is the required Answer