\(E\) interms of \(A\)

\(E^2 -2AE+A^2-0.36A =0\)

\(E^2 -2AE+A^2 =0.36A\)

\((E-A)^2 =0.36A\)

\(E-A =\sqrt{0.36A}\)

\(E =A\pm\sqrt{0.36A}\)

If \(A = 30\)

\(E =30+\sqrt{0.36(30)}\)

\(E = 33.29 \: \text{ft^2}\)

\(E =30-\sqrt{0.36(30)}\)

\(E = 26.71 \: \text{ft^2}\)