Question

Find the product of (x + 9i)^2?

Answer 1

just apply the (a+b)^2 formula
(a+b)^2=a^2+b^2+2ab
then you will get it....

Answer 2

do i just plug it into that formula? @chetan552

Answer 3

yes, x for a and 9i for b

Answer 4

ok thank you @SolomonZelman

Answer 5

Yes....@mariacruz07

Answer 6

Sorry, i forgot to say
after appling the formula you will see i^2 replace i^2 with -1 becouse "i" means imaginary number...
i^2=-1

Answer 7

@chetan552 would i apply the same formula to find the product of (x-2i)^2?

Answer 8

people use the FOIL method to remember how to multiply two binomials
(a+b)(c+d)
First: a*c
Outer a*d
Inner: b*c
Last: b*d
now add up to get ac+ad+bc+bd

if you have (a+b)(c -d)
treat it like
(a+b)(c+ -d)
and do the same thing
First: a*c
Outer: a*-d
Inner: b*c
Last: b* -d

put it all together: ac -ad +bc -bd

Answer 9

Yes you can....@mariacruz07