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( 9 + 5i)( 9 + 8i)

41+117i

Steps?

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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

(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

typo, 117i

i got it thanks guys just one questions why you do 40 ^2

it is 40 times i*i
i^2 which is -1

so do FOIL, but with the trick that i*i can be replaced with -1

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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