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RE: Cubic Formula Proof Step 2: Applying Vieta's Substitution to Obtain a Quadratic Equation

Part 3/5:

Simplifying the Equation

The goal at this stage is to eliminate the ( pz ) terms. By organizing and combining the resulting coefficients, we aim to cancel out specific terms to streamline the equation. Upon achieving the necessary cancellations, we can determine the value of ( K ) in relation to the coefficient ( p ). It is discovered that:

[

K = -\frac{p}{3}

]

This determination allows further simplification to occur.

Replacing and Rearranging

After finding ( K ), we substitute it back into the transformed cubic expression. The terms reconfigure to eliminate much complexity:

[

-z^3 + \frac{p^3}{27} z^3 + Q = 0

]