anonymous
  • anonymous
Reviewing and in need of a refreshment.
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
(4+2i)(3-5i)
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
use the FOIL rule here as well

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

jim_thompson5910
  • jim_thompson5910
and keep in mind that i^2 = -1
anonymous
  • anonymous
yeah, i know,. but i forget what i stands for .. i know how to simplify this question. Just a tangent off of this.
jim_thompson5910
  • jim_thompson5910
i is the imaginary number \[\large i = \sqrt{-1}\]
jim_thompson5910
  • jim_thompson5910
squaring both sides gives you \[\large i^2 = -1\]
anonymous
  • anonymous
so would the answer be 2?
jim_thompson5910
  • jim_thompson5910
no
anonymous
  • anonymous
so 12- 10^2
jim_thompson5910
  • jim_thompson5910
not sure how you got that
jim_thompson5910
  • jim_thompson5910
oh you did 4*3 = 12 and 2i*(-5i) = -10i^2 right?
anonymous
  • anonymous
yeah
jim_thompson5910
  • jim_thompson5910
well -10i^2 = -10(-1) since i^2 = -1
anonymous
  • anonymous
yeah.
jim_thompson5910
  • jim_thompson5910
so -10i^2 = -10(-1) = 10 which means -10i^2 = 10
jim_thompson5910
  • jim_thompson5910
but that's only part of the story
jim_thompson5910
  • jim_thompson5910
you forgot about the other parts of the FOIL method
anonymous
  • anonymous
i thought you multiply 4 and 3
jim_thompson5910
  • jim_thompson5910
|dw:1370158240619:dw|
jim_thompson5910
  • jim_thompson5910
FOIL F: multiply the First terms |dw:1370158288999:dw|
jim_thompson5910
  • jim_thompson5910
FOIL O: multiply the outer terms |dw:1370158318970:dw|
jim_thompson5910
  • jim_thompson5910
FOIL I: multiply the Inner terms |dw:1370158368382:dw|
jim_thompson5910
  • jim_thompson5910
FOIL L: multiply the Last terms |dw:1370158412390:dw|
jim_thompson5910
  • jim_thompson5910
we now have this 12 - 20i + 6i + 10 combine like terms to get 22 - 14i
anonymous
  • anonymous
oh. I just use my box!!
Jack1
  • Jack1
lol
jim_thompson5910
  • jim_thompson5910
oh the box method works too |dw:1370158600465:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1370158651254:dw| adding up and simplifying those terms will get you the same thing
anonymous
  • anonymous
Yeah. (;

Looking for something else?

Not the answer you are looking for? Search for more explanations.