Question 964644
.
W=width; L=length=W+3cm; A=area=70 sq cm
{{{WL=A}}} Substitute for L
{{{W(W+3cm=70cm^2)}}} Subtract 70 cm^2 from each side
{{{W^2+3W-70=0}}}
{{{(W-7)(W+10)=0}}}
{{{W-7=0}}} {{{or}}} {{{W+10=0}}}
{{{W=7}}} {{{or}}} {{{W=-10}}}
ANSWER 1: The width is 7 centimeters.
{{{L=W+3cm}}}={{{7cm+3cm=10cm}}}
ANSWER 2: The length is 10 centimeters.