Question 274690
{{{4*5*5=100}}}
{{{(4+x)(5+x)(5+x)=7(100)}}}
{{{(4+x)(25+5x+5x+x^2)=700}}}
{{{(4+x)(25+10x+x^2)=700}}}
{{{(100+40x+4x^2)+(25x+10x^2+x^3)=700}}}
{{{100+65x+14x^2+x^3=700}}}
{{{-600+65x+14x^2+x^3=0}}}
{{{x^3+14x^2+65x-600=0}}}
{{{x^2(x+14)+5(13x-120)=0}}}
x=-14,x=120/13  since x cant be a negative number, then x = 9.230769repeating

{{{5+x=9.23=4.23}}}

each was increased by {{{highlight(4.23))}}}
check
{{{8.23*9.23*9.23=701}}} if it was increased by 4.22 it would=698
hmmm for some reason i failed to calculate things correctly but by doing guess and check i came to the conclusion of 4.23