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sara1234 Group TitleBest ResponseYou've already chosen the best response.0
( 9 + 5i)( 9 + 8i)
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
41+117i
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
the foiling method, do you know what that is?
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
what do you do after (9*9)+(9*5i)+(9*8i)+(8i*5i)
 2 years ago

sritama Group TitleBest ResponseYou've already chosen the best response.1
(a+b)(c+d)=ab+bc+ad+bd
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
oh i just did it on the calculator, thats all you do there really is no steps
 2 years ago

sritama Group TitleBest ResponseYou've already chosen the best response.1
multiply them
 2 years ago

sritama Group TitleBest ResponseYou've already chosen the best response.1
do you know the meaning of i ?
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
look im write ok
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
81+157i i got this and i know its wrong can you khow steps so i can compare?
 2 years ago

sritama Group TitleBest ResponseYou've already chosen the best response.1
81+45i+72i40
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
i gave you the right answer
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
isnt it 40i
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
can i get my metal now ;)
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
i know you gave me the right answer but i need to know what i did wrong because i didnt get that
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
i is the square root of 1 so i*i = 1
 2 years ago

phi Group TitleBest ResponseYou've already chosen the best response.3
(9*9)+(9*5i)+(9*8i)+(8i*5i) 81 +45i +72i+40i^2 i^2 is 1 so 8140 + (45+72)i simplify 41+112i
 2 years ago

ilikephysics2 Group TitleBest ResponseYou've already chosen the best response.1
its 117i, phi you got it wrong
 2 years ago

sritama Group TitleBest ResponseYou've already chosen the best response.1
@ilikephysics2 is correct
 2 years ago

hartnn Group TitleBest ResponseYou've already chosen the best response.0
thats why 8i * 5*i = 40 i*i =40 *(1)= 40
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
i got it thanks guys just one questions why you do 40 ^2
 2 years ago

phi Group TitleBest ResponseYou've already chosen the best response.3
it is 40 times i*i i^2 which is 1
 2 years ago

phi Group TitleBest ResponseYou've already chosen the best response.3
so do FOIL, but with the trick that i*i can be replaced with 1
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
oh thank you @phi so when ever its i*i you have to change it to a negative?
 2 years ago

phi Group TitleBest ResponseYou've already chosen the best response.3
yes. i is short for sqrt(1) sqrt(1)*sqrt(1)= 1 so keep i's but replace i*i (or i^2) with 1
 2 years ago

sara1234 Group TitleBest ResponseYou've already chosen the best response.0
okay i get it thanks to all
 2 years ago
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