Question

Q29. Simplify: root 45+ root 80 -3 root 20​

Answer 1

Step-by-step explanation:

$\sqrt{45} + \sqrt{80} - 3 \sqrt{20} \\ = \sqrt{3 \times 3 \times 5} + \sqrt{2 \times 2 \times 2 \times 2 \times 5} - 3 \sqrt{2 \times 2 \times 5} \\ = 3 \sqrt{5} + 2 \times 2 \sqrt{5} - 3 \times 2 \sqrt{5} \\ = 3 \sqrt{5} \: + 4 \sqrt{5} - 6 \sqrt{5} \\ = \sqrt{5} (3 + 4 - 6) \\ = \sqrt{5} \times (7 - 6) \\ = \sqrt{5} \times 1 \\ = \sqrt{5} \: \: ans.$

Answer 2

Answer:

√5

Step-by-step explanation:

√45 + √80 + 3√20

= 3√5 + 4√5 - 3 × 2√5

= 7√5 - 6√5

= 1√5

= √5