Usha.S

The equation should be: Let x represent middle box, (x-2) represent top box and (x+2) represent side length of bottom box. 381=5(x+2)^2-(x)^2+5x^2-(x-2)^2+5(x-2)^2 then expand... and simplify to... 381=13x^2+4x+16 0=13x^2+4x-365 now use quad formula and x...