To solve the equation for x by completing the square what equation is equivalent to x^2-x-2=0
here are options for both blanks (the equivalent equation (x-blank)^2=blank

-1/4
1/4
-1/2
1/2
-9/4
9/4
-3/2
3/2

So to complete the square in
ax^2+bx+c=d form

make sure a=1
subtract c from both sides
take 1/2 of b and square it
add that to both sides
factor perfect square

1x^2-1x-2=0
a=1
move c to other side
add 2 to oth sides
x^2-1x=2
take 1/2 of b and square it
1/2 of -1=-1/2
squaer it
1/4
add that to both sides
x^2-1x+1/4=2+1/4
factor left side
(x-1/2)=2+1/4

first blank is 1/2

2+1/4=8/4+1/4=9/4

blanks are
1/2 and 9/4

Assuming you meant the commission is 12%, the salesperson will make $59.40 from selling the couch. If you take 495 multiplied by the percentage which in this case is 12 then divide that by 100, you get 59.40 you can also simply input 495 multiplied by 12 and then the % symbol and get the same answer.