Question

Simplify-

$\sqrt{45} + \sqrt{80 } - 3 \sqrt{20}$
​

Answer 1

Solution :

$\sqrt{45} + \sqrt{80} - 3 \sqrt{20}$

$= 3 \sqrt{5} + 4 \sqrt{20} - 3 \sqrt{20}$

$= 3 \sqrt{5} + (4 - 3) \sqrt{20}$

$= 3 \sqrt{5} + (1) (\sqrt{20} )$

$= 3 \sqrt{5} + \sqrt{20}$

Answer 2

Answer:

√5

Step-by-step explanation:

√45 = √(3×3×5) = 3√5

√80 = √(4×4×5) = 4√5

3√20 = 3√(2×2×5) = 3×2√5 = 6√5

√45 + √80 - 3√20 = 3√5 + 4√5 - 6√5

= (3+4-6)√5

= 1√5

= √5

Hope it helps you:)