Solve by using the quadratic formula 5x2 ndash 4x 1

Question

4. Solve by completing the square.  

x² + 2x – 8 = 0

A)  –4, –2    B)  –4, 2    C)  4, –2    D)  4, 2

9. Is the following trinomial a perfect square?

x² + 18x + 81

A)  No    B)  Yes

10. The demand and supply equations for a certain item are given by

    D = –5p + 40

    S = –p² + 30p – 8

Find the equilibrium price.

A)  $1.57    B)  $1.71    C)  $1.43    D)  $1.29

14. Solve.    x² + 16x + 60 = 0

A)  –6, 10    B)  6, –10    C)  –6, –10    D)  6, 10

19. Solve.    (x + 4)² = 4

20. Find the axis of symmetry.

y = –x² – 10x + 7

22. Solve by using the quadratic formula.  5x² – 4x + 1 = 0

23. Solve by completing the square.

4x² + 2x – 3 = 0