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The equation axn is the standard form used for differentiating terms in a polynomial.
The Power Rule
To differentiate axn, you multiply the coefficient (a) by the power (n) and then subtract 1 from the power.
f(x)=axn⟹f′(x)=anxn−1
Examples
- y=x3⟹dxdy=3x2
- y=5x4⟹dxdy=20x3
- y=10⟹dxdy=0
Before differentiating, terms must be in the axn format.
| Original Form | axn Form | Derivative |
|---|
| x21 | x−2 | −2x−3 |
| x | x1/2 | 21x−1/2 |
| x4 | 4x−1 | −4x−2 |
Differentiation Table
| Term | Derivative | Note |
|---|
| xn | nxn−1 | Standard Power Rule |
| ax | a | x term becomes constant |
| a | 0 | Constants disappear |