Question

simplify: 12 root 18 - 6 root 20 - 3 root 50 +8 root 45 plzz answer fast its really very 
 urgent

Answer 1

12√18 - 6√20 - 3√50 + 8√45
= 12(√9)(√2) - 6(√4)(√5) - 3(√25)(√2) + 8(√9)(√5)
= 12*3√2 - 6*2√5 - 3*5√2 +8*3√5
= 36√2 - 12√5 - 15√2 + 24√5
= √2(36 - 15) + √5(24 - 12)
= 21√2 + 12√5

Answer: 21√2 + 12√5