Answer:
4x² + 4x + 1
Step-by-step explanation:
We know that (a + b)² = a² + 2ab + b², therefore, (2x + 1)² = 4x² + 4x + 1.
(2x)^2 + 2(2x)(1) + (1)^2
4x^2 + 4x + 1
