Question

simplify: (5+root 7) (5-root 7)
plz help fastt

Answer 1

Answer:

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$(5 + \sqrt{7} )(5 - \sqrt{7} ) = {5}^{2} - ( \sqrt{7 } {)}^{2} \\ \\ = 25 - 7 \\ \\ = 18$

➡ by (a-b) (a+b) = a^2 - b^2

Hope it helps ☺

Answer 2

Answer:

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

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

$25 - 7$

$18$