Question 402980
If one number is x, second is (x+6)
Their product is {{{x*(x+6)=x^2+6x}}}
Equation 
{{{x^2+6x=775}}}
{{{x^2+6x-775=0}}}
{{{x = (-6 +- sqrt( 6^2-4*1*(-775)))/(2*1) }}} 
{{{x = (-6 +- sqrt( 3136)))/2 }}} 
{{{x1 = (-6 + 56)/2 }}}   {{{x2 = (-6 - 56)/2 }}} 
{{{x1 = 25 }}}   {{{x2 = -31 }}}
If {{{x1 = 25 }}} - is the first number, then the second number is {{{25+6=31}}}
If {{{x2 = -31 }}} is the first number, then the second number is {{{-31+6=-25}}}
Answer (25;31) or (-31;-25)