Question 1112950
If sqrt(28) + sqrt(7) = sqrt(A). Find A  
:
{{{sqrt(A)}}} = {{{sqrt(28) + sqrt(7)}}}
Factor 28 to reveal a perfect square
{{{sqrt(A)}}} = {{{sqrt(4*7) + sqrt(7)}}}
extract the square root of 4
{{{sqrt(A)}}} = {{{2*sqrt(7) + sqrt(7)}}}
Add like terms
{{{sqrt(A)}}} = {{{3*sqrt(7)}}}
square both sides
A = 9(7)
A = 63