Question

please give me the answers please give me the answers please ​

Answer 1

Q.12] (√3+√5) (3-√5)

=√3(3-√5) +√5(3-√5)

=3√3-√15+3√5-√25

Answer 2

Step-by-step explanation:

I.).

$4 \sqrt{81} - 8(3 \sqrt{216)} + 15(5 \sqrt{32)} + 225$

3 - 8(6) + 15(2) + 225

3 - 48 + 30 + 225

3 - 303

- 300 ans

ii.).

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

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

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