2 years ago

Find the sum of 3 - 7i and 8 + 4i.

2 answers:

3 0

Thanks for your equation!

This problem seems tricky, but is pretty simple.

All we have to do is add:

3 - 7i + 8 + 4i

And combine like terms:

-3i + 11

Hope this helps!

alexira [117]2 years ago

3 0

This problem looks tricky but in truth is very simple:
You simply add 3-7i+8+4i
You combine terms and it equals to- 11-3i

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Prove that if r is any rational number, then 3r2 − 2r + 4 is rational. The following properties may be used in your proof. Prope

ziro4ka [17]

Given:

Expression is

$3r^2-2r+4$

To prove:

If r is any rational number, then $3r^2-2r+4$ is rational.

Step-by-step explanation:

Property 1: Every integer is a rational number. It is Theorem 4.3.1.

Property 2: The sum of any two rational numbers is rational. It is Theorem 4.3.2.

Property 3: The product of any two rational numbers is rational. It is Exercise 15 in Section 4.3.

Let r be any rational number.

We have,

$3r^2-2r+4$

It can be written as

$3(r\times r)-2r+4$

Now,

3, -2 and 4 are rational numbers by property 1.

$r^2=r\times r$ is rational by Property 3.

$3r^2\text{ and }-2r$ are rational by Property 3.

$3r^2+(-2r)+4$ is rational by property 2.

So, $3r^2-2r+4$ is rational.

Hence proved.

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2 years ago

Please I need the answer :-)

Arturiano [62]

Answer:

Step-by-step explanation:

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1 year ago

Simplify. −7i⋅(−8i) −56 −56i 56i 56

Novay_Z [31]

Your answer is A. -56
Hope this helps!

8 0

3 years ago

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3 years ago

What is a requirement of supplementary angles? Supplementary angles must be adjacent. Supplementary angles must be nonadjacent.

Alex Ar [27]

Answer:

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Step-by-step explanation:

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2 years ago