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yes show me what you've done and the question

|dw:1354239603490:dw|

the last bit is wrong its not -80 its -40

oh that was -8sqrt5

-5 + 18 sqrt 5

that last bit is -8 sqrt 5?

it shouldn't be it should be -40

yeah cause it is 2sqrt5*4sqrt5

yes that should give you - 40

how did you get-40?? im a little confused

5 * 4 = 20 * -2

= -40

where does the 5 come from? the sqrt?

yes

so you take one of the 5's from one of the sqrt and leave the other one?

ok ignore the way i said let me try and explain the way you do it

so we have -2 sqrt 5 * 4 sqrt 5

-2 * 4 = -8

im sorry I just want to make sure i understand where the 5 comes from

sqrt 5 * sqrt 5 = 5

so we multiply -8 * 5 = -40

is that easier to understand?

oh so the sqrt * the same swrt will just be the number??

yes

that makes perfect sense actually

good :)

let me know if your confused about anything

your welcome =)