
How do I find the x intercept of a quadratic function in vertex form ?
Answer
481.2k+ views
Hint: The x intercept of any function is the points where the curve of function cuts the x axis that means the value of function is 0 at x intercept. So actually the roots of the equation are x intercepts of the equation.
Complete step by step answer:
The given vertex form of the quadratic equation is
The coordinate of vertex is (-2,-9)
We have to find the x intercepts of the equation
We know that the x intercepts are roots of the equation, where the value of the function is 0
So now we have to solve
So there are maximum 2 x intercepts possible for
Adding 9 in both LHS and RHS
Multiplying 4 in both LHS and RHS we get
So now we can see
The value can be 6 0r -6
So the value of x can be 4 or -8
So the x intercepts of are 4 and -8.
intersect x axis at point (4,0) and (-8,0)
We can draw the graph of
We can see the vertex is point V(-2,-9) and the 2 x intercepts are A(-8,0) and B(4,0).
Note:
If the 2 function f and g are inverse function of each other, then the x intercept of f is equal to y intercept of g. The y intercept of f is equal to x intercept of g this is because the function f and g are mirror images of each other with respect to the straight line .
Complete step by step answer:
The given vertex form of the quadratic equation is
The coordinate of vertex is (-2,-9)
We have to find the x intercepts of the equation
We know that the x intercepts are roots of the equation, where the value of the function is 0
So now we have to solve
So there are maximum 2 x intercepts possible for
Adding 9 in both LHS and RHS
Multiplying 4 in both LHS and RHS we get
So now we can see
The value
So the value of x can be 4 or -8
So the x intercepts of
We can draw the graph of

We can see the vertex is point V(-2,-9) and the 2 x intercepts are A(-8,0) and B(4,0).
Note:
If the 2 function f and g are inverse function of each other, then the x intercept of f is equal to y intercept of g. The y intercept of f is equal to x intercept of g this is because the function f and g are mirror images of each other with respect to the straight line
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