+0  
 
+1
63
2
avatar

 

SHOW WORK PLZ!! SO I CAN LEARN IT BETTER

Guest Sep 26, 2018
edited by Guest  Sep 26, 2018
 #1
avatar+92505 
+2

1)

4x^2 + 16x  = 48      subtract 48 from both sides

 

4x^2 + 16x  - 48  = 0      factor out the 4

 

4(x^2 + 4x - 12)  = 0      divide away the 4

 

x^2 + 4x - 12   = 0        factor this

 

(x + 6) ( x - 2)   = 0

 

Set both factors to 0  and solve for x and we get that   x  = -6   or  x = 2

 

2)

x^2 + 7x  = -6    add 6 to both sides

 

x^2 + 7x + 6  = 0    factor the left side 

 

(x + 6) ( x + 1)   = 0     

 

Set both factors to 0  and solve for x and we get that   x  = -6   or  x = -1

 

 

cool cool cool

CPhill  Sep 26, 2018
 #2
avatar+92505 
+2

1)

 

x^2 - 3x  = 18     subtract  18 from both sides

 

x^2  - 3x - 18  = 0    factor the left side

 

(x - 6) ( x + 3)   = 0

 

Set both factors to 0  and solve for x and we get that   x  = 6   or  x = -3

 

 

2) 

 

x^2   - 3x +  ___   =  18  +   ___

 

Take 1/2 of 3  = 3/2...square this  = 9/4...add to both sides

 

x^2  - 3x + 9/4  =  18 + 9/4        factor the left side  and simplify the right

 

(x - 3/2)^2  = 72/4 + 9/4

 

(x - 3/2)^2  =  81/4         take both roots 

 

x - 3/2  = ±√ [ 81/4]    take the square root on the right

 

x - 3/2 = ± 9/2     add 3/2 to both sides

 

x = 3/2 ±9/2   which means that  x  = 3/2 + 9/2  = 12/2  = 6   or   x = 3/2 - 9/2  = -6/2  = -3

 

 

cool cool cool

CPhill  Sep 26, 2018

10 Online Users

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.