If using the method of completing the square to solve the quadratic equation x2 + 15x + 4 = 0, which number would have to be added to "complete the square"?

The number which number would have to be added to "complete the square" is

Step-by-step explanation:

We need to solve the equation by completing square method.

The general form is

Solving equation using completing square method

We would be adding and subtracting 15/2 to make it a complete square

So, now it can be written in form of

So,using the method of completing the square to solve the quadratic equation x2 + 15x + 4 = 0 we get  

The number which number would have to be added to "complete the square" is

b

step-by-step explanation:

the word superfluous means unnecessary