Atraeus is solving the quadratic equation by completing the square

Question

7x2 – 14x + 6 = 0

      7x2 – 14x = –6

     A(x2 – 2x) = –6

What is the value of A?
–14
2
7
6

Answer 1

You started with a quadratic (x^2) coefficient of 7 and a linear (x) coefficient of -14.  To produce an argument with a quadratic coefficient of 1 and a linear coefficient of -2, you must have factored out a 7.

 

7 is the value of A.