If using the method of completing the square to solve the quadratic equation
x2 + 14x + 34 = 0, which number would have to be added to "complete the
square"?

Step-by-step explanation:

In order to complete the square, you first see the coefficient of x. Given that:

2a = 14 or a = 7

All that's left to do is to simultaneously add and subtract a^2 = 49, to complete the square.

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)