How do i solve by factoring x^4-50x^2+49=0

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

Anature center offer 2 guided walks. the morning walk is 2/3 miles. the evening walk is 3/6 mile. which is shorter

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?