Differentiate w.r.t. y
21y^{2}
Evaluate
7y^{3}
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\frac{\mathrm{d}}{\mathrm{d}y}(7y^{3})
Combine 8y^{3} and -y^{3} to get 7y^{3}.
3\times 7y^{3-1}
The derivative of ax^{n} is nax^{n-1}.
21y^{3-1}
Multiply 3 times 7.
21y^{2}
Subtract 1 from 3.
7y^{3}
Combine 8y^{3} and -y^{3} to get 7y^{3}.
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