9.5-6 RWS
Autograph: _____________________________________
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#1-6,
33
a. Find the discriminant
b. Determine the number of solutions
c. Find all real solutions
1. a2 + 8a + 7 = 0
2. v2 - 4v =
-6
4. 2a2 + 9a = 5
5. v2 + 16 =
-8v
3. 10 -6d = -d2
6.
- 2a2 - 9a + 12 = 0
#7-9, How many x-intercepts will the graph of each equation have? ( 1 pt ea.)
7. y = 4x2 + 10
10. Graph y =
8. y = x2 - 8x + 16
-x2 + 2x + 10
9. y = 3.5x2 + 5x - 2.5
on the coordinate plane at right.
a. What is the vertex of graph? (2)
b. What are the x-intercepts for this graph? (2)
c. What are the solutions to this equation? (1)
d. When does
-x2 + 2x + 10
= 7? (1)
e. How many solutions to 11 = -x2 + 2x + 10? (1)
f. How many solutions to 15 = -x2 + 2x + 10? (1)
11.
An potato is launched at 58 feet per second from a 175-foot tall platform. ( 1 pt ea.)
a. Write the equation for the potato's height in feet(h), at time t seconds after launch (h(t) = -16t2 + vt + s).
b.
Exactly when does the object strike the ground (round to 100ths)?
c. How high does the potato get?