Question 544706
{{{A=L*W}}} area=length times width
A=30
L=7+w

{{{30=(7+w)(w)}}}
{{{30=7w+w^2}}}
{{{w^2+7w-30=0}}} find two numbers that multiply to get -30 and add to get +7: +10 and -3, 10(-3)=-30, 10-3=7
{{{(w+10)(w-3)=0}}} solve
{{{w=-10}}}{{{w=3}}} width cant be negative
{{{highlight(w=3)}}}
{{{L=7+(3)}}}
{{{highlight(L=10)}}}