(x + 3)2 = 18 extracting square root

Question

(x + 3)2	 = 	18 extracting square root

anonymous · Answer

2x + 6 = 18
    -6       -6
2x = 12
x = 6

anonymous · Answer

oh is it (x+3)^2 = 18 ?

in that case it's 
x^2 + 3x +3x +9 = 18
x^2 +6x+9= 18
factoring
(x+3)(x+3)=18

x+3 =18
  -3   -3
x = 15


or 


x+3 = sq root of 18
which becomes 

x = sqrt18 -3

anonymous · Answer

sqrt of 18  is 3sqrt2

anonymous · Answer

this is extracting square root,  the answer is a +-in a square root box

anonymous · Answer

Using the above rule, extract the square roots of the given quadratic equation.
(x + 3)2	 = 	18

x + 3	 = 	± 

  
Correct: Your answer is correct.
 

x + 3	 = 	± 3

  
Incorrect: Your answer is incorrect.

anonymous · Answer

well the answer can be plus or minus depening on which number plugged back into the equation gives you a true statement

anonymous · Answer

my first answer was square root of 18

anonymous · Answer

so the answer is supposed to be x= +/- sqrt18 (3sqrt2) -3 ? which should be positive ?

anonymous · Answer

im not sure what the boxes mean?

anonymous · Answer

it is the square root box it just wouldn't show sorry

anonymous · Answer

i believe it's just asking for the x+3?

anonymous · Answer

sorry i couldn't be more help. gotta go.

anonymous · Answer

thanks you have been of great help i appreciate that.

triciaal · Answer

extracting square roots

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