What are the zeros of the quadratic function f(x) = 8x2 – 16x – 15? x = –1 – Startroot 2 EndRoot and x = –1 + Startroot 2 EndRoot x = –1 – StartRoot StartFraction 15 Over 8 EndFraction EndRoot and x = –1 + StartRoot StartFraction 15 Over 8 EndFraction EndRoot x = 1 – StartRoot StartFraction 23 Over 8 EndFraction EndRoot and x = 1 + StartRoot StartFraction 23 Over 8 EndFraction EndRoot x = 1 – StartRoot 7 EndRoot and x = 1 + StartRoot 7 EndRoot

or

Step-by-step explanation:

The given quadratic function is

To find the roots, we set f(x)=0 to get:

The solution is given by:

where a=8, b=-16, c=-15

We substitute to get:

We simplify to get:

or

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!