Question

Can someone please help me with this? Thanks :)

https://media.glynlyon.com/g_alg01_2013/8/2a124.gif

Answer 1

\[? + 2\sqrt{5}\]

Answer 2

Apply distribution.
Like (a+b) (c+d) = ac + ad + bc + bd

Answer 3

so, \[(\sqrt{5} \times \sqrt{5})+(\sqrt{5} \times 2)+(4 \times \sqrt{5})+(4 \times 2)\] ?

Answer 4

Check your signs.

Answer 5

\[(\sqrt{5} \times \sqrt{5})+(\sqrt{5} \times 2)+(4 \times \sqrt{5})+(4 \times -2)\]

Answer 6

negative two :3

Answer 7

Check your sign again.

Answer 8

lol ok haha i see :) \[(\sqrt{5} \times \sqrt{5})+(\sqrt{5} \times -2)+(4 \times \sqrt{5})+(4 \times -2)\]

Answer 9

Simplify it now. :)

Answer 10

wait.. how do I do that?

Answer 11

sorry, I am still learning this subject :/

Answer 12

all I know is -8 in the last set of parentheses. How do I times a square root to anything?

Answer 13

It's 5 + -2sqrt5 + 4 sqrt 5 - 8
which is equal to -3+ 2 sqrt5
sorry but i have to go

Answer 14

ok :) thanks for your help :)