there's nothing in your screen
The value of y is, 
We have given that,
We have to determine the value of y,
<h3>What is the formula for the quadratic equation?</h3>
Therefore,we get
Therefore the value of y is,
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Answer:
(-5,-1,1)
Step-by-step explanation:
You must substitute for <em>x</em>.
y= x^2 - 6x-7
Vertex = -b /2a
b= -6
a= 1
-(-6)/2(1)= 3
x= 3
Use the substitution method to find y
y= (3)^2-6(3)-7
(3)(3)-18-7
9-25
y= -16
Vertex is (3, 16)
Find x- intercept (y= 0)
y= x^2 - 6x-7
(x-7)(x+1)
x-7= 0
Move -7 to the other side. Sign changes from -7 to 7
x-7+7= 0+7
x= 7
x+1= 0
Move +1 to the other side. Sign changes from +1 to -1
x+1-1= 0-1
x= -1
Answer :B. Vertex: (3, -16); Intercepts: x=-1,7
