Question

simplify 2 under root 45 - 4 under root 20​

Answer 1

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Answer 2

Answer: -2√5

Step-by-step explanation:

Hello..

2√45 - 4√20

= 2√3×3×5 - 4√2×2×5

= 2×3√5 - 4×2√5

=6√5- 8√5

= -2√5

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