Question

simplify : (5+✓7) (5-✓7)​

Answer 1

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Identity 3 : (a + b)(a - b) = a² - b²

$(5 + \sqrt{7} )(5 - \sqrt{7} )$

${5}^{2} - {( \sqrt{7} )}^{2}$

$25 - 7$

$18$

Answer 2

use formuala a*2-b*2 y will get 18