Question

4 root 45 - 2 root 80 + root 245​

Answer 1

4√45 - 2√80 + √245​ = 20.1750670885

4√45 = 26.8328157

2√80 = 17.8885438

√245​ = 15.6524758

26.8328157 - 17.8885438 + 15.6524758 = 20.1750670885

Answer 2

Answer:

4√(45)−2√(80)+√(245)

=4√(3×3×5)−2√(2×2×2×2×5)+√(5×7×7)

[as 45=3×3×5; 80=2×2×2×2×5; 245=5×7×7]

=4×3√(5)−2×2×2√(5)+7√(5)

=12√(5)−8√(5)+7√(5)

=(12−8+7)√(5)

=11√(5)