Question

(5+3root 2) (5-3 root 2)​

Answer 1

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Answer 2

$(5 + 3 \sqrt{2} )(5 - 3 \sqrt{2} )$

using identity

$(a + b)(a - b) = a {}^{2} - b {}^{2}$

${5}^{2} - (3 \sqrt{2} ){}^{2}$

$25 - 9 \sqrt{4}$

$25 - 18$

$7$