What number should be added to both sides of the equation to complete the square? x^2 + 8x = 4
a.4
b.8
c.16
d.32

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation:

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents