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Answered

Perform, √20-√45+√49 a. -6√5 b. 6√5 c. 8√5 d. 4√5​

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Answer:

√20 - √45 + √49

√2² × 5 - √3³ × 5 + √7²

√2²√5 - √3²√5 + 7

2√5 - 3√5 + 7

-1√5 + 7

= 6√5 (B)