Alright, Alyssa, let's do this.
First, let's look at the square root of 216y2 and break it down.
216y2 = 2(2)(2)(3)(3)(3)(y)(y)
Every pair goes out front singularly.
√216y2 = 2(3)(y)√2(3) = 6y√6
The 4 already there multiplies, so we end up with 24y√6
I'll skip the steps, but 3√54y2 = 9y√6
Hey, since both have y and √6, they are like terms!
24y√6 + 9y√6 = 33y√6
Hope this helps!
