In this method, it make use of the sum of root and product of root to find the x value when the y is zero.
Quadratic equations has a symmetry at mid-point between the roots.
The difference before and after the middle point has to be the same!
A standard equation of x^2 - (R1+R2)x + (R1)(R2)= 0 has to be used to obtain the root by the end.
Then the sum of root = R1+ R2 = -b/a
Also, the product of root = (R1)(R2) = c/a
Following ax^2 + bx + c = 0, getting the root by solving the unknown by first getting the midpoint.
Hope this help simplify.
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