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Step by step
- \frac{d}{dy}\left[y \left(1 - y\right)\right]
Differentiate 2 times, one derivative at a time.
- y \frac{d}{d y} \left(1 - y\right) + \left(1 - y\right) \frac{d}{d y} y
Product rule with u = y and v = 1 - y: (uv)′ = u′v + uv′.
- y \left(\frac{d}{d y} 1 + \frac{d}{d y} \left(- y\right)\right) + \left(1 - y\right) \frac{d}{d y} y
Sum rule: differentiate term by term.
- y \frac{d}{d y} \left(- y\right) + \left(1 - y\right) \frac{d}{d y} y
The derivative of a constant is 0.
- - y \frac{d}{d y} y + \left(1 - y\right) \frac{d}{d y} y
Constant multiple rule: pull the constant out.
- 1 - 2 y
d/dx of x is 1.
- f^{(1)}(y) = 1 - 2 y
That is derivative number 1.
- \frac{d}{d y} 1 + \frac{d}{d y} \left(- 2 y\right)
Sum rule: differentiate term by term.
- \frac{d}{d y} \left(- 2 y\right)
The derivative of a constant is 0.
- - 2 \frac{d}{d y} y
Constant multiple rule: pull the constant out.
- -2
d/dx of x is 1.
- f^{(2)}(y) = -2
That is derivative number 2.
Reveal the answer
f''(y) = -2