Solve {l}{b=sqrt{5}}{c=-16ab+8(a+b)^2}{text{Solvefor}dtext{where}}{d=c}

$$\left. \begin{array} { l } { b = \sqrt{5} }\\ { c = -16 a b + 8 {(a + b)} ^ {2} }\\ { \text{Solve for } d \text{ where} } \\ { d = c } \end{array} \right.$$

Solve for b, c, a, d

$$b=\sqrt{5}\approx 2.236067977\text{, }c=40\text{, }a=0\text{, }d=40$$

$$b=\sqrt{5}\approx 2.236067977\text{, }c=d\text{, }a=\frac{\sqrt{2\left(d-40\right)}}{4}\text{, }d\geq 40$$

$$b=\sqrt{5}\approx 2.236067977\text{, }c=d\text{, }a=-\frac{\sqrt{2\left(d-40\right)}}{4}\text{, }d\geq 40$$