Which of the following reveals the minimum value for the equation 3x2 + 18x + 15 = 0?

a)3(x + 3)2 = 6
b)3(x + 9)2 = 12
c)3(x + 3)2 = 12
d)3(x + 9)2 = 228

Which ordered pair is the best estimate for the solution of the system of equations? the graph of the system of equations : y = 3/2x +6 and y=1/4x - 2 , -3) .5, -3.5) , -4) , -3.5)