Expanding the expression (x² + 5)(3x² - 1), we get:
= x²(3x²) + x²(-1) + 5(3x²) + 5(-1)= 3x^4 - x² + 15x² - 5= 3x^4 + 14x² - 5
Therefore, (x² + 5)(3x² - 1) is actually equal to 3x^4 + 14x² - 5, not 2x^4 + 18x².
Expanding the expression (x² + 5)(3x² - 1), we get:
= x²(3x²) + x²(-1) + 5(3x²) + 5(-1)
= 3x^4 - x² + 15x² - 5
= 3x^4 + 14x² - 5
Therefore, (x² + 5)(3x² - 1) is actually equal to 3x^4 + 14x² - 5, not 2x^4 + 18x².