How do you solve this exponential equation

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

△abc is similar to △xyz. also, side ab measures 6 cm, side bc measures 18 cm, and side xy measures 12 cm. what is the measure of side yz ? enter your answer in the box.

Find the solution set for this equation: t^2+7t=0 separate the two values with a comma.