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2 √45 + √ 80

= 2 √5 *9 + √5 * 16

=  6 √5 + 4 √5 = 10 √5

2 √45 * √80

=  6 √5 * 4 √5

= 24√25

= 120

x² - 2 x - 180 = - 12

( 6 √5)²  - 2 ( 6 √5)  - 180 = - 12

180 - 12 √5 - 180 = - 12

- 12 √5 ≠ - 12

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