Question

By+increasing+each+side+of+a+square+by+5+cm,+its+area+increases+by+165+square+cm.+What+is+the+length+of+the+side+of+the+square

Answer 1

${x}^{2} = x {}^{2} \\ = > \\ = > {(x + 5)}^{2} = 165 + {x}^{2} \\ = > {x}^{2} + 10x + 25 = {x}^{2} + 165 \\ = > 10x = 140 \\ = > x = 14cm$