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katrin2010 [14]
3 years ago
15

NEED HELP ASAP!!!!!!!!!!!!!!

Mathematics
2 answers:
maria [59]3 years ago
8 0

Answer:

its B

Step-by-step explanation:

just run all of them through the equation.

Vilka [71]3 years ago
3 0

Answer:

A

Step-by-step explanation:

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If (3-4i) (x+iy) = 3 root 5<br> show that x^2 + y^2=9/5
NNADVOKAT [17]

Answer:

the answer is 2 + i.

Step-by-step explanation:

Let the square root of 3 + 4i be x + iy.

So (x + iy) (x +iy) = 3 +4i

=> x^2 + xyi + xyi + i^2*y^2 = 3 + 4i

=> x^2 – y^2 + 2xyi = 3 + 4i

Equate the real and complex terms

=> x^2 - y^2 = 3 and 2xy = 4

2xy = 4

=> xy = 2

=> x = 2/y

Substitute in

=> x^2 - y^2 = 3

=> 4/y^2 - y^2 = 3

=> 4 – y^4 = 3y^2

=> y^4 + 3y^2 – 4 = 0

=> y^4 + 4y^2 – y^2 – 4 =0

=> y^2(y^2 + 4) – 1(y^2 + 4) =0

=> (y^2 – 1) (y^2 + 4) =0

Therefore y^2 = 1, we ignore y^2 = -4 as it gives complex values of y.

Therefore y = 1 and x = 2/1 = 2

The required square root of 3 + 4i is 2 + i.

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3 years ago
What's the factored form of 0.00008x^4+200?
pickupchik [31]

Answer:

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Step-by-step explanation:

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What do we use to replace for an unknown number?
Zigmanuir [339]

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A. A variable

Step-by-step explanation:

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Levi invested $160 in an account paying an interest rate of 3% compounded daily.
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The amount is $200.00 and the interest is $40.00

Step-by-step explanation:

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