help please i dont understand this?
Use the technique of completing the square to transform the quadratic equation into the form
(x + c)2 = a

6x^2 – 36x + 42 = 0

Question

help please i dont understand this?
Use the technique of completing the square to transform the quadratic equation into the form 
(x + c)2 = a

6x^2 – 36x + 42 = 0

radar · Answer

Step 1:  Divide thru by 6 getting: x^2 - 6x + 7 = 0
Step 2: add to both sides, the square of 1/2 of the x coefficient  (6)
             1/2 of 6 is 3, 3 squared is 9     the equation now will look like:
           x^2 - 6x + 9 = 9
Step 3.  complying with the problem write the equation like they have requested
(x - 3)^2 = 9

radar · Answer

Purpose of Step 1.  Get the x^2 term with a coefficient of 1.
purpose of step 2.  Obtain a value that can be added that will result in the left side being a perfect square.  Please note.  I erred on this part.  The equation would look like:
X^2 - 6x + 7 + 9 = 9      Now subtract 7 from both sides getting:
x^2 - 6x + 9 = 2    Now go with the last step
(x - 3)^2 = 2

radar · Answer

Sorry about the error, it can happen.

radar · Answer

Do you have any further questions regarding this problem??

ladiesman217 · Answer

no thanks