Question 108056
L=2W+3
L*W=10
(2W+3)*W=10
2W*2+3W-10=0
USING THE QUADRATIC EQUATON WE GET
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
X=(-3+-SQRT[3^2-4*2*-10])/2*2
X=(-3+-SQRT[9+80])/4
X=(-3+-SQRT89)/4
X=(-3+-9.43)/4
X=(-3+9.43)/4
X=6.43/4
X=1.6 ANSWER FOR THE WIDTH.
L=2*1.6
L=3.2+3
L=6.2 FOR THE LENGTH.
PROOF
1.6*6.2=10
10=10