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What value completes the square for the expression?

 

1. x^2 + 12x

a. −36

b. −6

c. 6

d. 36

 

2. x^2 - 8x

a. 4

b. -4

c. 16

d. -16

 

3. x^2 - 18x

a. 81

b. -9

c. -81

d. 9

 

Thank you!

mathelp  Mar 28, 2018
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1+0 Answers

 #1
avatar+85673 
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This is pretty simple....believe it, or not    !!!

 

1.   x^2  +  12x

Take  1/2  of 12  =  6

Square this  = 6^2  =  36.....and that's what we need to add to complete the square  !!!!

 

2. x^2 - 8x

Take (1/2)  of -8  = -4

Square this  = (-4)^2  =   16

 

3. x^2  - 18x

Take (1/2) of -18  = -9

Square this  (-9)^2   =  81

 

 

 

cool cool cool

CPhill  Mar 28, 2018

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