turtlebug9399 turtlebug9399
  • 25-01-2019
  • Mathematics
contestada

how do I solve this? (6+8i)(4-7i)
step by step??
I just need a tutor...

Respuesta :

gmany
gmany gmany
  • 25-01-2019

[tex]Use:\\\\FOIL:\\(a + b)(c + d) = ac + ad + bc + bd\\\\i=\sqrt{-1}\to i^2=-1\\-----------------------\\\\(6+8i)(4-7i)=(6)(4)+(6)(-7i)+(8i)(4)+(8i)(-7i)\\\\=24-42i+32i-56i^2=24-10i-56(-1)=24-10i+56\\\\=80-10i\\\\Answer:\ \boxed{(6+8i)(4-7i)=80-10i}[/tex]

Answer Link

Otras preguntas

Find the equation of the line which passes through (−5, 2) and the point of intersection of the lines x + 3y=0 and 4x − 4y −13=0.
PLEASE I NEED HELP !!!!! “It sounds like what your teacher did really upset you. I understand how you feel.” This statement reflects which principle of effectiv
What is the value of x? X + 4/9= 3/4
Puritanism is a version of O Baptist O Catholicism O Calvinism O Pentecostalism
Latoya, Ravi, and Kareem sent a total of 81 text messages during the weekend. Ravi sent 2 times as many messages as Kareem. Latoya sent 5 more messages than Kar
How can G.R.A.P.E.S. help you study civilization?
types of accounting concepts?
These factors are responsible for environmental problems in Sub-Saharan Africa. Select all that apply. deforestation ecotourismnegative population growth agricu
If you were to rotate ABCD 180° about the origin, what would the coordinate of A' be? (-5,5) (-3, 3) (-5,3) (-3, -5)
Help me with this, I will be posting more questions!