Question

state how many complex and real zeros the function has..

f(x) = x^2 + 8x - 7

Answer 1

Use the quadratic formula to find the solutions.
This has no complex solutions and the two solutions it has are both real.

Answer 2

on my paper there are only 4 options
A. 2 complex no real
B. 2 complex 1 real
C. 2 complex both real
D. 4 complex 2 real

@wolf1728

Answer 3

Wow I only know there are 2 solutions both real.

Answer 4

cloey, what's the discriminant (b^2 - 4ac) , if it's a positive value or zero, then the answers are REAL, else Complex

Answer 5

Here is a quadratic equation calculator:
http://www.1728.org/quadratc.htm
It shows two solutions
x = 0.79583
x = -8.7958
both are real.
neither are complex

Answer 6

Some of those answers seem ridiculous:
C: 2 complex both real
What is that supposed to mean?

Answer 7

i don't know... I'm pretty sure my instructor is insane... but thank you! @wolf1728

@kx2bay it's 36, that's what I got

Answer 8

It's like saying the equation has 2 odd solutions - both numbers are even

Answer 9

she taught us that all complex numbers are real numbers @wolf1728

Answer 10

look up the definition of complex number - wait a minute - I'll look it up.

Answer 11

complex numbers can have a real `components` but they are not real altogether....
what is this shinanigans?

Answer 12

cloey its not 36 but rather 92, remember that c = -7 and -4ac = +28 ;)

Answer 13

I found this at dictionary.com
complex number -
a mathematical expression ( a + bi ) in which a and b are real numbers and i² = −1.
Notice it does NOT say all the numbers are real.

Answer 14

I ended up with:\[\Large\rm x=-4\pm \sqrt{23}\]Which are two `real numbers`.
Option C seems to be the only one close.
I think maybe your teacher doesn't know what complex means.
Or there was a typo in the question.

Answer 15

@zepdrix basically my teacher is somewhat insane and telling me that all complex numbers are real numbers.
@kx2bay okay but... where on earth do i go from there?
@wolf1728 i have no idea what to say other than : there's a reason she got fired this year

Answer 16

lolol oh boy XD

Answer 17

@zepdrix thank you! but... just use the quadratic essentially?

Answer 18

ya quadratic should get you there c:

Answer 19

thank you c: @zepdrix

Answer 20

yes the answer is C
your teacher is correct although bit in sane
the "i" part of the Complex number, i.e. the Imaginary part is Zero when you have a Real number