The answer will depend on the sign associated with 13 which, thanks to the rubbish browser that we are obliged to use, we cannot see. The constant term needs to be 1 so if it is -13 you need to add +14 and
if it is +13 you need to add -12.
You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.You must add 36 to complete the square on the left hand side.
144
-3
You must add 1
You must add (17n + 144).
Adding 100 completes the square. { I wonder why you want to complete the square when the expression already factors as x(x-20) }.
4
it is 121
49/4 or 12.25
-7
94
You need to add -22.