Question

Simplify (5+√7) (5-√7)
plz friends do it fast​

Answer 1

hey buddy,

here is your answer..

Answer:

18

Step-by-step explanation:

$(5 + \sqrt{7} )(5 - \sqrt{7} ) \\ use \: the \: identity \\ {x}^{2} - y {}^{2} = (x - y)(x + y) \\ \\ = (5) {}^{2} - ( \sqrt{7} ) {}^{2} \\ = 25 - 7 \\ = 18$

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