x = ± 6i
step-by-step explanation:
x^2 = -36
take the square root of each side
sqrt(x^2) = sqrt(-36)
we know sqrt(ab) = sqrt(a) sqrt(b)
x = ±sqrt(36) sqrt(-1)
we know that sqrt (-1) = i
one fourth of 9% = 2.25%
gavin is correct in saying : the equivalent quarterly interest rate would be
2.25%.