Answer:
A = 4x⁴ - 38x² + 81
Step-by-step explanation:
The formula for the area of a square is side X side, or side squared, or A = s².
Substitute the equation of a side into the formula.
A = s²
A = (2x² - 9)²
A = (2x² - 9)(2x² - 9) <=distribute over brackets
A = 4x⁴ - 18x² - 18x² + 81 <= collect the like terms - 18x² and - 18x²
A = 4x⁴ - 38x² + 81 <= final equation for area
