Find the equation of the tangent line to y=6^((x^2)-4x+8)) at x=3.

I have worked very hard on this problem, but I can not find the right answer.... I keep getting:
y=[(ln6)(6^5)(6)]+[7776-[(ln6)(6^5)(6)]]=7776, but it says this is not correct. Please help!

nevermind i figured it out!