A square pyramid is shown with the following dimensions. The height of the square pyramid is 5x+7. Length L is the side of the base of the pyramid.

Find an expression for L, in terms of the variable, x.
Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: A square pyramid is shown with the following dimensions. The height of the square pyramid is 5x+7. Length L is the side of the base of the pyramid.

Find an expression for L, in terms of the variable, x.
Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: A square pyramid is shown with the following dimensions. The height of the square pyramid is 5x+7. Length L is the side of the base of the pyramid.

Find an expression for L, in terms of the variable, x.