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

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Question:

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

Answers

Hello : y= -x²-4x-1y = - (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)

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