The graph shows the function f(x) = x² in green and another function g(x) in purple.
Which of the following could be the equation for g(x)? Circle the correct choice.
a g(x) = -x²
b. g(x)=x²-6
c. g(x)=x² +6
d. g(x) = (x - 1)³
f(x)=x²
g(x)= ?