Question

can you still use the foil method even tho there is a plus sign?
(-1+6i)+(-4+2i)

Answer 1

NO!!

Answer 2

Add the like terms.

Answer 3

No. Absolutely not.

(a+b)(c+d) = ac + bd + ad + bc

But

(a+b) + (c+d) = a + b + c + d

Answer 4

Rearrange the 4 terms.

Answer 5

=1+(-4) +6i+2i

Answer 6

(-1+6i)+(-4+2i) = (-1 + -4) + (6i + 2i)
= ...

Answer 7

Add 1 and -4 then add 6i and 2i

Answer 8

You will get -3 + 8i

Answer 9

-5+8i
thanks guys

Answer 10

Mertsj, you've dropped the minus sign in front of the 1.

Answer 11

Whoops!!I It's -1 so you will get -5+8i

Answer 12

Thanks James. My old eyes don't see so well anymore.

Answer 13

FOIL means multiply, not add, sorry ...