√(- 9 ) / (( 4 - 7 i ) - ( 6 - 6 i )) = 3 i / ( 4 - 7 i - 6 + 6 i ) =
= 3 i / ( - 2 - i ) = - 3 i / ( 2 + i ) =
$= \frac{-3i}{2 + i}* \frac{2 - i}{2 - i}= \\ = \frac{-6i+3i ^{2} }{2- i^{2} }= \\ = \frac{-3-6i}{2+1}= \frac{-3-6i}{3}=$
= - 1 - 2 i

5 0

3 years ago

Solve,justify and check: 3(7+5n)=6n+6(1+4n)

vlabodo [156]

Answer:

1=n

Step-by-step explanation:

Step 1- Distribute into the parenthesis.

7(3)+5(3)n= 6n+1(6)+4(6)n

Step 2- Multiply

21+15n= 6n+6+24n

Step 3- Add common variables to simplify.

21+15n= (24n+6n)+6

21+15n= 30n+6

Step 4- Subtract the smallest variable to both sides.

21+15n= 30n+6

-15n -15n

21= 15n+6

Step 5- Subtract 6 to both sides.

21= 15n+6

-6 -6

15= 15n

Step 6- Divide both sides by 15.

15= 15n

15 15

1=n

4 0

3 years ago

Read 2 more answers

I think of a number. When I add 12 and subtract 8, I get 15. What is that number?

zheka24 [161]

Answer:

11?

Step-by-step explanation:

Hope I'm right! (:

3 0

2 years ago

Read 2 more answers

If we just randomly guess (without any knowledge) on each of the 4 questions, what is the expected number of questions we get co

goldfiish [28.3K]

YOUR HAIRLINE YOUR HAIR LINE YOUR HARLINE YOUR HARLINE BOIIIII ITS FU**** UP

7 0

3 years ago