Answer:
y = x² + 8x + 16
Step-by-step explanation:
blue square = x × x = x²
green rectangle = 4 × x = 4x
yellow square = 4 × 4 = 16
Let y = total area of the square
⇒ y = blue square + green rectangle + green rectangle + yellow square
= x² + 4x + 4x + 16
= x² + 8x + 16
