Question

please help
Q. 3 please​

Answer 1

Answer:

$17+3\sqrt{5} +25+7\sqrt{5}$

$=(17 + 25) + ( 3\sqrt{5}+7\sqrt{5} )$

$= 42 + 10\sqrt{5}$

$= 2(21 + 5\sqrt{5} )$

Step-by-step explanation:

Answer 2

Answer:

54.2360....

Step-by-step explanation:

$(17 + 3 \sqrt{5} )(25 + 7 \sqrt{5} \\ (17 + 25)(3 \sqrt{5} + 7 \sqrt{5} ) \\ (42)(3 + 7 \sqrt{5} ) \\ 42 + 10 \sqrt{5} \\ 52 + \sqrt{5} \\ 52 + 2.2360....$

Square root of 5 = 2.2360......

52+2.2360....

=54.2360......