+0  
 
0
226
4
avatar+2077 

2 q's- please help, ty!

RainbowPanda  Apr 26, 2018

Best Answer 

 #1
avatar+5252 
+3

Question 1: Simplify the expression: \((2-3i)(4+2i)\)

 

For this, we'll use the FOIL method.

 

2*4=8

 

8+__+__+__

 

2*2i=4i

 

8+4i+__+__

 

-3i*4=-12i

 

8+4i-12i+__

 

-3i*2i=-6i2

(I'm assuming i=sqrt(-1))

 

8+4i-12i+6=14-8i

 

Option S is your answer

 

Question 2: Simplify the expression: \((3x^4+9x^3-7x+15)+(-6x^4-8x^2+5x-3)\)

 

This is adding like terms.

 

First, let's start with x^4

 

3-6=-3

 

-3x4+9x3-8x2+__+__

 

There were only one x^3 and x^2 in the expression, so we know that part for sure.

 

Now, to the x term.

 

-7+5=-2

 

-3x4+9x3-8x2-2x+__

 

Now, to the normal numbers.

 

15-3=12

 

Final answer: -3x4+9x3-8x2-2x+12

 

Hope this helped!

rarinstraw1195  Apr 26, 2018
edited by rarinstraw1195  Apr 26, 2018
 #1
avatar+5252 
+3
Best Answer

Question 1: Simplify the expression: \((2-3i)(4+2i)\)

 

For this, we'll use the FOIL method.

 

2*4=8

 

8+__+__+__

 

2*2i=4i

 

8+4i+__+__

 

-3i*4=-12i

 

8+4i-12i+__

 

-3i*2i=-6i2

(I'm assuming i=sqrt(-1))

 

8+4i-12i+6=14-8i

 

Option S is your answer

 

Question 2: Simplify the expression: \((3x^4+9x^3-7x+15)+(-6x^4-8x^2+5x-3)\)

 

This is adding like terms.

 

First, let's start with x^4

 

3-6=-3

 

-3x4+9x3-8x2+__+__

 

There were only one x^3 and x^2 in the expression, so we know that part for sure.

 

Now, to the x term.

 

-7+5=-2

 

-3x4+9x3-8x2-2x+__

 

Now, to the normal numbers.

 

15-3=12

 

Final answer: -3x4+9x3-8x2-2x+12

 

Hope this helped!

rarinstraw1195  Apr 26, 2018
edited by rarinstraw1195  Apr 26, 2018
 #2
avatar+5252 
+2

EDIT: Included Question 2

rarinstraw1195  Apr 26, 2018
 #3
avatar+91078 
+1

Thanks, Rarinstraw  !!!

 

 

cool cool cool

CPhill  Apr 26, 2018
 #4
avatar+2077 
+2

Tysm! :D

RainbowPanda  Apr 26, 2018

44 Online Users

avatar
avatar
avatar
avatar
avatar
avatar
avatar
avatar
avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.