Question

Can someone walk me through how to solve this problem?

(5+radical2) (5- radical 2)

Answer 1

use the formula
a^2 - b^2 = (a+b)(a-b)

Answer 2

wait don't you foil?

Answer 3

it will be a longer way

Answer 4

can u show me how to foil it? Im confused on foiling with radicals so can u make sure I'm doing it correctly?(:

Answer 5

sure, go ahead and solve it

Answer 6

ok when i do \[5 \times -\sqrt{2}\]... im confused wut i get?
-radical 10 or something else?

Answer 7

u get -5(radical 2)

Answer 8

\[-5\sqrt{2}\]

Answer 9

and then also what do i get when I times radical 2 times -radical 2...is it -radical 2 or -radical 4

Answer 10

\[\sqrt{2} * \sqrt{2} = 2\]

Answer 11

so it would equal radical 4 and that equals 2 right?

Answer 12

no it would equal -2

Answer 13

oh i see... is there a certain rule i should know when multiplying radicals?

Answer 14

since it is same as \[\sqrt{2}\times \sqrt{2}\times(-1) = -2\]

Answer 15

wait so wut is the answer to this problem?

Answer 16

25 - 2 = 23

Answer 17

ok thanks

Answer 18

ur welcome

Answer 19

can u help me with another problem?