Question

(-3+ √5)(-3 - √5) simplify​

Answer 1

Answer:

4

Step-by-step explanation:

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

$(-3+\sqrt{5})(-3-\sqrt{5})=(-3)^{2}-(\sqrt{5}) ^{2}$

                                $=9-5$

                                $=4$

Answer 2

Answer:

4

Step-by-step explanation:

$( - 3 + \sqrt{5)} ( - 3 - \sqrt{5)}$

$= ( { - 3})^{2} - ( \sqrt{5)}^{2}$

$using \: identity$

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

$= 9 - 5$

$= 4$