Sienna is solving the quadratic equation by completing the square.

Question

3x2 + 9x – 4 = 0

      3x2 + 9x = 4

   A(x2 + 3x) = 4

What is the value of A?
–4
–3
3
4

Answer 1

3x² + 9x        the common numerical factor is 3

3(x² + 3x)

 

3