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(7 + √2)² - (7 - √2)²
(7 + √2)(7 + √2) - (7 - √2)(7 - √2)
(49 + 7√2 + 7√2 + 2) - (49 - 7√2 - 7√2 + 2)
(49 + 14√2 + 2) - (49 - 14√2 + 2)
49 + 14√2 + 2 - 49 + 14√2 - 2
49 - 49 + 14√2 + 14√2 + 2 - 2
28√2
= ( 7 + √2 + 7 - √2)(7 + √2 - (7 - √2))
= (14)( 7 + √2 - 7 + √2)
= (14)(2√2)
= 28√2
semogamembantu♣