When multiplying fractions do i multiply straight across or find the common denominator

How do you determine if an ordered pair is a solution to a given equation?

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.

Write the fraction for the part that is shaded. then find the equivalent fraction.