you have to first find the derivative of the original function. You then make the derivative equal to zero and solve for x.
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A zero of a function is a point at which the value of the function is zero. If you graph the function, it is a point at which the graph touches the x-axis.
It is sometimes the point where the value inside the absolute function is zero.
A root is the value of the variable (usually, x) for which the polynomial is zero. Equivalently, a root is an x-value at which the graph crosses the x-axis.
Y = 2.5X ( + 0 ) So, zero is the Y intercept of this function.
Interpreting that function as y=x2+2x+1, the graph of this function would be a parabola that opens upward. It would be equivalent to y=(x+1)2. Its vertex would be at (-1,0) and this vertex would be the parabola's only zero.