Question

What is the solution set of the equation:
7q^2 - 28 = 0

Answer 1

7q² - 28 = 0
     + 28 + 28
       7q² = 28
         7      7
         q² = 4
          q = ±4
          q = 4    or    q = -4

Solution Set: {±4} and {q|q = 4 or q = -4}