+1124 Hi good people!, for the following sum I get a different answer to the book, and no matter how many times I do this sum, I keep getting the same answer. please help me to see where I'm going wrong?
√−5(√−3∗√−4)
√5∗−1(√3∗−1∗√22∗−1)
√5i(√3i∗√22i)
√5i(√3i∗2√i)
√15i2∗2(−1)
−2√15i2
The book says −2√15i
Thanx for the help!!
+118703 Hi Juriemagic :)
√−5=√5∗−1=√5∗√−1=√5i
So your mistakes strat in the third row.
√−5(√−3∗√−4)√5∗√3∗√4∗i∗i∗i2√15∗−1∗i−2√15i
This is different from your answer but different from your book too.
Are you sure you copied in the book answer correctly?
+1124 Hello Melody!!!!,
I am going to be VERY honest about this....the answer I actually got, was exactly the same as what you got...I promise you that. this morning when I posted the problem, i did not have my paper that i worked on, with me, so I did the sum afresh...and got lost. I figured that it was'nt a train smash if i did not put the sum exactly as I actually had it....the answer is wrong any case...so I left it as such
Yes I also did the 3 "i"'s etc...
Melody, yes, I checked and re-checked that answer....the "i" looks like it is within the square root sign...maybe they did a mis-print?
