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quick question, is this the same as this???

cuz I got -4 square root of 5
but the answer sheet said -2 square root of 5 minus 2.

probably a stupid question but I have a test on it tmr and I want to make sure cuz u never know if they’re tryna trick u

quick question is this the same as this cuz I got 4 square root of 5 but the answer sheet said 2 square root of 5 minus 2 probably a stupid question but I have class=

Respuesta :

altavistard
Your first steps are correct.  Mult. the given fraction by (1+sqrt(5)) / (1+sqrt(5)).

Result:  8(1 + sqrt(5) )       8(1 + sqrt(5) )
             ------------------- = ----------------------
                 1 - 5                         -4

Must keep that denominator (-4).

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