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( 9 + 5i)( 9 + 8i)
41+117i
Steps?

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Other answers:

18 =13I
the foiling method, do you know what that is?
what do you do after (9*9)+(9*5i)+(9*8i)+(8i*5i)
(a+b)(c+d)=ab+bc+ad+bd
oh i just did it on the calculator, thats all you do there really is no steps
multiply them
do you know the meaning of i ?
look im write ok
81+157i i got this and i know its wrong can you khow steps so i can compare?
81+45i+72i-40
i gave you the right answer
isnt it 40i
i^2=-1
can i get my metal now ;)
i know you gave me the right answer but i need to know what i did wrong because i didnt get that
i is the square root of -1 so i*i = -1
  • phi
(9*9)+(9*5i)+(9*8i)+(8i*5i) 81 +45i +72i+40i^2 i^2 is -1 so 81-40 + (45+72)i simplify 41+112i
why 40^2?
its 117i, phi you got it wrong
@ilikephysics2 is correct
thats why 8i * 5*i = 40 i*i =40 *(-1)= -40
  • phi
typo, 117i
i got it thanks guys just one questions why you do 40 ^2
  • phi
it is 40 times i*i i^2 which is -1
  • phi
so do FOIL, but with the trick that i*i can be replaced with -1
oh thank you @phi so when ever its i*i you have to change it to a negative?
  • phi
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
okay i get it thanks to all

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