Which of the following is the conjugate of a complex number with 2 as the real part and -8 as the imaginary part?

-2 + 8i
2 + 8i
2 - 8i
-2 - 8i

Question

Which of the following is the conjugate of a complex number with 2 as the real part and -8 as the imaginary part?

 -2 + 8i
 2 + 8i
 2 - 8i
 -2 - 8i

anonymous · Answer

@ganeshie8 2-8i?

ganeshie8 · Answer

thats your original given complex number
not the conjugate

anonymous · Answer

then would it be 2+8i?

ganeshie8 · Answer

yes! for conjugate you just flip the sign of imaginary part

anonymous · Answer

can you check 2 more for me :D?

anonymous · Answer

What is the equation in point-slope form of the line passing through (-3, -4) and (0, 2)?

 (y - 8) = 2(x - 3)
 (y + 3) = -2(x + 4)
 (y - 2) = -2(x + 4)
 (y + 4) = 2(x + 3)

ganeshie8 · Answer

http://www.scs.sk.ca/cyber/elem/learningcommunity/math/math30aa/curr_content/matha30rev1/lesson3-4/PONITSLOPEFORMULA.JPG

anonymous · Answer

i get y=2x+2

ganeshie8 · Answer

thats right, but they just want the point slope form

ganeshie8 · Answer

did you get slope = `2`  ?

anonymous · Answer

yes

ganeshie8 · Answer

very good, next pick a point and plug them in the point-slope formula

uri · Answer

y-y1=mx(x-x1)

m=2
y1=-4
x1=-3

plug in the formula

ganeshie8 · Answer

^

anonymous · Answer

y + 4 = mx(x +3)

anonymous · Answer

oops

anonymous · Answer

(y +4) = 2(x+3)

uri · Answer

Right :D

anonymous · Answer

ok thank you! and this last one which i forgot how to do
Find the average rate of change for the given function from x = -3 to x = 1.

anonymous · Answer

2, -3, -1, -2 are answer choices

ganeshie8 · Answer

average rate of change between two points is same as the slope of secant line between those points

ganeshie8 · Answer

where is your function ?

anonymous · Answer

can't get picture to post, I'll write it out

anonymous · Answer

x: -3, 0, 1
y: -3, 3, 5

ganeshie8 · Answer

simply find the slope between those two given points

ganeshie8 · Answer

x: ` -3`, 0, `1`

y: ` -3`, 3, `5`

ganeshie8 · Answer

(-3, -3)   and   (1, 5)

anonymous · Answer

2

anonymous · Answer

mx = 2

ganeshie8 · Answer

Yes! slope of the line joinng both the points is called the average rate of change of function between those two points

ganeshie8 · Answer

you're done! 2 is the average rate of change

anonymous · Answer

I didn't know all you had to do was find the slope haha

anonymous · Answer

thanks again, i just found 2 more that i could use some help with because i forgot the material. do you have time?

ganeshie8 · Answer

sure, post them as new thread..

anonymous · Answer

okay