Question

(root7-root3) (root7+root3)​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

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

so

$( \sqrt{7} - \sqrt{3} ) ( \sqrt{7} + \sqrt{3} ) = { \sqrt{7} }^{2} - { \sqrt{3} }^{2} \\ \\ = 7 - 3 = 4$