How to Solve Quadratic Equation Graphically

Using graph to solve quadratic equations
In earlier chapters I've shown you how to solve quadratic equations by factoring, Completing the Square and by the use of General Formula.
A quadratic equation as you remember is an equation that can be written on the standard form:
ax²+bx+c=0, where a≠0
Another way of solving a quadratic equation is to solve it graphically. The roots of a quadratic equation are the x-intercepts of the graph, i.e the point(s) where the curve (parabola) touches the x-axes.
Graphing the equation could be done by making a table of values which you will see in this lesson.
A graph of x against y is plotted by joining the points of intersection between x and corresponding y values.
The point(s) where the curve touches the x axes determine the solution for such quadratic Equation.
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Thanks this really help me.. but my problem is when the answers turns out to be a fraction how do I solve it? Do you have any video to that?

[@tambuwalmathsclass]

I haven't made that yet. But the best way is to write the answer in decimal. Every centimeter contains 5 small boxes, so when the points exceed the major line, you consider every box as a point.

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Can you do the one that has a equation with brackets

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I have a question how do you get the numbers on the table for X on my book the graph is not always negative please help!

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I only chose random values of x from negative to positive which is allowed in graphing

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Can you do y=x^2+6x+9 , -5

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It was very understandable, but sir what's the root of the equation???

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Brother, what if the range is not given.

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What is the maximum value

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What if that x squared is a number like 4 and that three is like seven

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Why the change of - to + sign

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How did u get the first number like _4 _3 at the top?

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They are chosen integers

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To some numbers you subtract, to some you add Please explain

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what if youre not given the range

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Not really

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To use complete square

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Pls sir can you explain how you bring _4

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They are jus range of values of x, not constan though. You can always estimate them not necessarily -4

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