Question 317531
{{{ (5u+6x+5)(u+4x+7)= 5u(u+4x+7)+ 6x(u+4x+7)+ 5(u+4x+7)}}}
{{{ (5u+6x+5)(u+4x+7)= (5u^2+20ux+35u)+ (6xu+24x^2+42x)+ (5u+20x+35)}}}
{{{ (5u+6x+5)(u+4x+7)= 5u^2+24x^2+26ux+40u+62x+35}}}