Algebra-1

( −x² + 4)(3x⁴ − 7x²)

Expanding the expression:

= (−x²)(3x⁴) + (−x²)(−7x²) + (4)(3x⁴) + (4)(−7x²)

= −3x⁶ + 7x⁴ + 12x⁴ − 28x²

Now, let's combine like terms:

= −3x⁶ + (7x⁴ + 12x⁴) − 28x²

= −3x⁶ + 19x⁴ − 28x²

Therefore, the expanded expression using superscripts is:

−3x⁶ + 19x⁴ ...