What number needs to be added to both sides of the equation in order to complete the square? x2−18x=17 enter your answers in the boxes. x^2−18x + __ =17 + __

81

The square (x -a)² is ...

... (x -a)² = x² -2ax +a²

You can see the constant term (a²) is the square of half the x-coefficient ...

... a² = (-2a/2)²

The square of half the x-coefficient in your equation is ...

... (-18/2)² = (-9)² = 81

So, your equation is ...

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)