How can you tell if a fraction is a unit fraction

For what values of x is x2 + 2x = 24 true?

Kristen is wrapping presents for the holidays. she has a box that measures 4 ft. x 2 ft. x 2 ft. how many square feet of wrapping paper does she need to cover the box without overlapping?

Use long division to indentify (12xto the second power+15x-8)divided by 3x