Question 924371
Use the FOIL method to work out the left hand side.
{{{(3Y-1)(2Y+K)=6Y^2+3KY-2Y-K}}}
{{{(3Y-1)(2Y+K)=6Y^2+(3K+2)Y-K}}}
Now compare it to the right hand side.
1.{{{A=6}}}
2.{{{3K+2=B}}}
3.{{{-K=-5}}}
From eq. 3,
{{{K=5}}}
Use that in eq. 2,
{{{3(5)+2=B}}}
{{{B=17}}}
So then,
{{{A+B=6+17}}}
{{{A+B=23}}}