What are the real or imaginary solutions of each polynomial equation? X^4-20x^2=-64

Answer this question, only if you know the answer. 30 points and brainliest!

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base