x2+6x+17 = (x+3)2+8, so you must add -8.
-7
You need to add -22.
To complete the square for the expression (x^2 + 9x), take half of the coefficient of (x) (which is 9), square it, and add that value. Half of 9 is (4.5), and squaring it gives (20.25). Therefore, the number that must be added is (20.25). Thus, the completed square form is ((x + 4.5)^2).
Put in the - or + values for 4x and 7 is the first step in finding the number needed
9
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.
-3
144
You must add 1
You must add (17n + 144).
4
it is 121
-7
49/4 or 12.25
Adding 100 completes the square. { I wonder why you want to complete the square when the expression already factors as x(x-20) }.
94
You need to add -22.