Question

Simplify: (2✓3+✓5) (2✓3-✓5 )​

Answer 1

Step-by-step explanation:

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

$(12 - 2 \sqrt{15} ) +( 2 \sqrt{15} - 5)$

$(12 - 2 \sqrt{15} + 2 \sqrt{15} - 5)$

$= 12 - 5 = 7$

Answer 2

Answer:

I think ,

(2root3+root5)(2root3-root5)

It is in (a+b)(a-b) formula so we know

(a+b)(a-b)=asquare-bsquare

=(2root3)square - (root5)square

=2root 3 - root 5(answer)