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Vsevolod [243]
4 years ago
6

Determine whether or not f is a gradient vector field. if it is, find a function φ such that f = ∇φ. (if the vector field is not

a gradient field, enter dne.) f(x, y) = (2x − 6y) i + (−6x + 10y − 7) j
Mathematics
1 answer:
MArishka [77]4 years ago
4 0
\mathbf f(x,y)=(2x-6y)\,\mathbf i+(-6x+10y-7)\,\mathbf j

For \mathbf f to be the gradient of some scalar function \varphi(x,y), we need to find \varphi that satisfies

\dfrac{\partial \varphi}{\partial x}=2x-6y
\dfrac{\partial \varphi}{\partial y}=-6x+10y-7

From the first PDE, it follows that (upon integrating with respect to x)

\varphi(x,y)=x^2-6xy+g(y)

Differentiating with respect to y yields

\dfrac{\partial\varphi}{\partial y}=-6x+10y-7=-6x+\dfrac{\mathrm dg}{\mathrm dy}
\implies\dfrac{\mathrm dg}{\mathrm dy}=10y-7\implies g(y)=5y^2-7y+C

\implies\varphi(x,y)=x^2-6xy+5y^2-7y+C
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