The Area is the width<span> times the </span>height<span>: A = w x h; Then, 64 = w x h; h = 4 + w; 64 = 4w + w^2; w^2 + 4w - 64 = 0; We solve this equation: w1 </span>≈ 6,24 > 0 (okay); w2 ≈ - 10,24 < 0 (not okay); <span>Finally, h1 </span>≈ 10,24;<span>
The maximum value of that graph is 1 and we can prove this by means of this graph: http://assets.openstudy.com/updates/attachments/4fe27e44e4b06e92b87169f6-syderitic-1340243754047-unt...