Question 128326
3SQRT12+4SQRT3=3SQRT(4*3)+4SQRT4SQRT3=3*2SQRT3+4SQRT3=(6+4)SQRT3=10SQRT3.
8SQRT5-2SQRT45=8SQRT5-8SQRT(9*5)=8SQRT5-(8*3)SQRT5=(8-24)SQRT5=-16SQRT5.