The graph of y = x^2 has been translated 7 units to the left. The equation of the resulting parabola is _____.
y = (x - 7)^2
y = (x + 7)^2
y = x^2 - 7
y = x^2 + 7
y = (x - 7)^2
y = (x + 7)^2
y = x^2 - 7
y = x^2 + 7