Question

simplify (4+3root5)(4-3root5)​

Answer 1

ANSWER-> -29

Solution-

$= > (4 + 3\sqrt{5} )(4 - 3 \sqrt{5} ) \\ by \: applying \: the \: identity \\ - > (a + b)(a - b) = {a}^{2} - {b}^{2} \\ = > ({4})^{2} - (3 \sqrt{5}) ^{2} \\ = > 16 - (9 \times 5) \\ = > 16 - 45 \\ = > - 29$

Hope it helps:)