Question

What is the vertex, y intercept, and a value of this equation? "y=-x^2-4x-1"?

Answer 1

Hello : 
y= -x²-4x-1
y = - (x²+4x+1)
y = - ((x²+4x+4)-4+1)
y = - ((x+2)²-3)
y = -(x+2)²+3     the vertex is A(-2 ; 3)