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For Your Specific Query -
If the Roots of the quadratic equation are   R1 = 0  &  R2 = 0.
The required formula is     (x - [R1])(x - [R2]) = 0
Input values into formula     (x - [0])(x - [0]) = 0
And resulting equation is       (x - 0)(x - 0) = 0
Which multiplies to                 x2 - 0x - 0x + 0 = 0
And Quadratic Equation is       x2 - 0x + 0 = 0
As a General Formula / Algorithm -
If the Roots of the quadratic equation are   R1 = A   &   R2 = B.
The required formula is     (x - [R1])(x - [R2]) = 0
Input values into formula     (x - [A])(x - [B]) = 0
And resulting equation is       (x - A)(x - B) = 0
Which multiplies to                 x2 - Bx - Ax + B*A = 0
And Quadratic Equation is       Cx2 - (B+A)x + B*A = 0
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