Review 9.1­9.3
Evaluate each expression. Give the exact value if possible. Otherwise, approximate to the nearest hudredth.
1. √144
2. ­√196
3. √6
4. √2.25
Solve the equation.
5. x2 = 169
6. 4x2 = 64
7. 7x2 + 30 = 9
8. 2x2 ­ 4 = 10
Simplify.
9. √18
10. √5 √20
11. 2√121
√4
12. √75 13. ­3√54
14. 8√27 √72
Tell whether the graph of the function opens up or down. Find the coordinates of the vertex. Write the equation of the axis of symmetry.
15. y = x2 + 2x ­ 11
16. y = 2x2 ­ 8x ­ 6
Graph.
17. y = x2 + 6x + 5
18. y = ­x2 ­ 4x ­ 3
19. y = x2 ­ 6x +10