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 Feb17 comment Differential Equation $y'' - 4y' + 4y = 0$ is it considered to have "repeated roots" if the roots are (r-2)(r+2)? (roots of 2 and -2). No right? Feb17 asked Differential Equation $y'' - 4y' + 4y = 0$ Feb17 accepted Differential Equation $(2x^2 + y^2)\,dx - xy \, dy = 0$ Feb17 comment Differential Equation $(2x^2 + y^2)\,dx - xy \, dy = 0$ In most problem (that I've seen so far) that are homogeneous, you set $u =\frac{y}{x}$ , if I set $u =\frac{x}{y}$ would that be a problem or would it just give you the same thing? Feb17 comment Differential Equation $(2x^2 + y^2)\,dx - xy \, dy = 0$ Now I have,$$y' = \frac{2x^2 + y^2}{xy}$$ $$yy' = 2x + \frac{y^2}{x}$$ Feb17 asked Differential Equation $(2x^2 + y^2)\,dx - xy \, dy = 0$ Feb17 accepted Diff Eq. : Find an explicit solution of $y^2 - 1 = y'$ Feb17 asked Diff Eq. : Find an explicit solution of $y^2 - 1 = y'$ Jan25 asked Differential Equation Basic - please explain the detail of this step Jan25 comment Differential Equation: Using substitution $u(x)=y+x$, solve $\frac{dy}{dx} = (y+x)^2$ what if $u(x) = y^3$. what would be $\frac{dy}{dx}$ in this case. Jan25 comment Differential Equation: Using substitution $u(x)=y+x$, solve $\frac{dy}{dx} = (y+x)^2$ thank you! I see i now Jan25 reviewed Approve Differential Equation: Using substitution $u(x)=y+x$, solve $\frac{dy}{dx} = (y+x)^2$ Jan25 accepted Differential Equation $y' = \frac{ty(4-y)}{(1+y)}$ Jan25 asked Differential Equation: Using substitution $u(x)=y+x$, solve $\frac{dy}{dx} = (y+x)^2$ Jan25 comment Differential Equation $y' = \frac{ty(4-y)}{(1+y)}$ i feel kinda stupid after knowing that. Jan25 asked Differential Equation $y' = \frac{ty(4-y)}{(1+y)}$ Jan10 asked Laplace Transform of multiplied term like $u(t)u(4-t)$ Dec11 accepted Using Green's theorem to compute an area of a region Dec11 comment Partial differentiation dz/ds when function of z is differentiable function of x and y but not given explicitly Indeed. Thank you. Dec11 asked Partial differentiation dz/ds when function of z is differentiable function of x and y but not given explicitly