please help me please will give brainliest
please show your work

Answer:
A
Step-by-step explanation:
Area of shape A: (3x² + 2)(7x² + 4x + 8) = 21x^4 + 12x³ + 38x² + 8x + 16
Area of shape B: (3x² + 2)(3x² + 2) = 9x^4 + 12x² + 4
Difference: 12x^4 + 12x³ + 26x² + 8x + 12