Question

5. Find the product of (x + (3+5i))2.

Answer 1

please help me I do not understand this,

Answer 2

I think it is x^2 + 64 ????

Answer 3

is not difficult . you just distribute 2 over whats in the brackets.
in other words multiply x , + 3 and + 5i by 2 then simplify

Answer 4

@cwrw238
@arabpride
@LastDayWork
@amriju

Answer 5

unless I've misunderstood the question - is the 2 an exponent?

Answer 6

oh no, sorry its 5. (x + (3+5i))^2.
squared, not times 2, sorry

Answer 7

oh ok

Answer 8

sorry

Answer 9

oh, and the i is an imaginary number

Answer 10

(x + (3+5i) * (x + (3+5i)
= x^2 + x(3 + 5i) + x(3 + 5i) + (3 + 5i)(3 + 5i)
= x^2 + 3x + 5xi + 3x + 5xi + 9 + 15i + 15i - 25

can you continue?

Answer 11

so, then I just combine like terms and simplify, right?

Answer 12

yes

Answer 13

x^2 + 6x + 10xi + 30i + 3x - 19???

Answer 14

no how did you get the -3x and -19 ?

Answer 15

um ... so
x^2 + 3x + 5xi + 3x + 5xi + 9 + 15i + 15i - 25 --> this is what you gave me
x^2 + 10xi + 6x + 30i -19???? --> so, i saw one mistake... there is no 3x, but what makes -19 wrong? can u explain?

Answer 16

+ 9 - 25 = -16

Answer 17

oh... ok, i subtracted wrong... silly me
so x^2 + 10xi + 6x + 30i -16?

Answer 18

Thanks soooo much!... :)

Answer 19

you deserve a fan, a fan testimonial, and a medal. :D