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What is the vertex of the function given y equals x plus 4x plus 7?
Wiki User
∙ 13y ago
Vertex implies quadratic equation.
Y = X^2 + 4X + 7
set to 0
X^2 + 4X + 7 = 0
subtract 7 from each side
X^2 + 4X = - 7
Now, complete the square. Halve the linear tern (4), square it and add it to both sides.
X^2 + 4X + 4 = - 7 + 4
gather terms on the right and factor on the left
(X + 2)^2 = - 3
(X + 2)^2 + 3 = 0
(-2,3)
------------------is the vertex
Wiki User
∙ 13y ago
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