1. Group terms: 10x^4 + 10x^3 + 5x^2 + 5x
2. Factor by grouping: 10x^3(x + 1) + 5x(x + 1)
3. Factor out common binomial: (10x^3 + 5x)(x + 1)
4. Simplify the first parenthesis: 5x(2x^2 + 1)
5. Final factorization: 5x(2x^2 + 1)(x + 1)
Answer: 5x(2x^2 + 1)(x + 1)