Question 593005
Use the general rule that says
{{{ ( a + b )*( c + d ) = a*c + b*c + a*d + b*d }}}
First, factor out all the 5's
{{{ (5x+5)(5x+5) = 5*( x + 1 )*( x + 1 ) }}}
Using the above general rule:
{{{ (5x+5)(5x+5) = 5*( x^2 + x + x + 1 ) }}}
{{{ (5x+5)(5x+5) = 5*( x^2 + 2x + 1 ) }}}
{{{ (5x+5)(5x+5) = 5x^2 + 10x + 5 ) }}}