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ilikephysics2Best ResponseYou've already chosen the best response.1
the foiling method, do you know what that is?
 one year ago

sara1234Best ResponseYou've already chosen the best response.0
what do you do after (9*9)+(9*5i)+(9*8i)+(8i*5i)
 one year ago

sritamaBest ResponseYou've already chosen the best response.1
(a+b)(c+d)=ab+bc+ad+bd
 one year ago

ilikephysics2Best 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
 one year ago

sritamaBest ResponseYou've already chosen the best response.1
do you know the meaning of i ?
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.1
look im write ok
 one year ago

sara1234Best 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?
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.1
i gave you the right answer
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.1
can i get my metal now ;)
 one year ago

sara1234Best 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
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
i is the square root of 1 so i*i = 1
 one year ago

phiBest 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
 one year ago

ilikephysics2Best ResponseYou've already chosen the best response.1
its 117i, phi you got it wrong
 one year ago

sritamaBest ResponseYou've already chosen the best response.1
@ilikephysics2 is correct
 one year ago

hartnnBest ResponseYou've already chosen the best response.0
thats why 8i * 5*i = 40 i*i =40 *(1)= 40
 one year ago

sara1234Best ResponseYou've already chosen the best response.0
i got it thanks guys just one questions why you do 40 ^2
 one year ago

phiBest ResponseYou've already chosen the best response.3
it is 40 times i*i i^2 which is 1
 one year ago

phiBest ResponseYou've already chosen the best response.3
so do FOIL, but with the trick that i*i can be replaced with 1
 one year ago

sara1234Best 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?
 one year ago

phiBest 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
 one year ago

sara1234Best ResponseYou've already chosen the best response.0
okay i get it thanks to all
 one year ago
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