Question

What are the zeros of the quadratic function f(x) = 2x2 + 16x – 9?

Answer 1

The first step is to simplify the quadratic. Can you do that?

Answer 2

yeah i did that

Answer 3

\[(2x^2+16x-9) = 0\]

Answer 4

What did you get for your answer?

Answer 5

So, you have the zeros right there. What exactly is the problem?

Answer 6

its right there in the screenshot

Answer 7

Are you trying to get from your answer to the answers provided? If so, then you have to find a common denominator and add them together. That's all they did.

Answer 8

okay do you have to square root it ?

Answer 9

a=2 b=16 c=-9
x = -b +-sq root(b^2 -4*a*c) / 2*a
x = -16 +-sq root(256 +72) / 4
x = -16 +- sq root(328) / 4
x = -4 +- sq root(328)/4

I messed up - this is the correct answer

Answer 10

And yes, you need that square root

Answer 11

and then you get the square root of 82

Answer 12

x = -4 +- [sq root(82*4)/4 ]