Can someone help, I know that it's geometric but I don't know the explicit/recursive formulas

you have to give me a question for me too answer or i cannot help you at all hope this helps

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.