Question

evaluate (√5+2√2)² - (√5-√9)²​

Answer 1

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Answer 2

(√5+2√2)² - (√5-√9)²

(√5)² + (2√2)² +2×√5×2√2 - (√5)² - (√9)² +2×√5×√9

5+8+4√10 - 5 -9 +2√45

4√10 +2√45 - 1

2√5(2√2+√9) - 1