Question

7+15 7-15
1. Simplify: 7-v5*7+v5​

Answer 1

Answer:

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Answer 2

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

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

/* By algebraic identity */

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

$= 49 - 5$

$= 44$

Therefore.,

$\red{(7+\sqrt{5})(7-\sqrt{5})}\green { = 44}$

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