Regroup terms.
\[1-2yy+y\times 2+l=0\]
Use Product Rule: \({x}^{a}{x}^{b}={x}^{a+b}\).
\[1-2{y}^{2}+y\times 2+l=0\]
Regroup terms.
\[1-2{y}^{2}+2y+l=0\]
Subtract \(1\) from both sides.
\[-2{y}^{2}+2y+l=-1\]
Add \(2{y}^{2}\) to both sides.
\[2y+l=-1+2{y}^{2}\]
Regroup terms.
\[2y+l=2{y}^{2}-1\]
Subtract \(2y\) from both sides.
\[l=2{y}^{2}-1-2y\]
l=2*y^2-1-2*y
