should be "how many real number equations..."
Recall the determinant: b^2-4ac
If it is zero, there is a single root. Here, the determinant is 6^2+4(-7)(3) = 120
So, your choice is incorrect.
FYI, regarding the determinant:
positive: 2 roots
zero: 1 root
negative: no real roots
This is because in the quadratic formula the roots are
x = (-b±√(b^2-4ac))/2a
so, if the determinant is positive, you are adding/subtracting a real nonzero value from -b/2a
you can see what happens if it is zero or negative.
It's called the discriminant because it discriminates among the kinds of roots.
how many real number equations does this equation have?
0= -7x^2+6x+3
A. 1 solution*
B. 2 solutions
C. no solutions
D. infintie solutions
3 answers
b² - 4 a c
is the discriminant not determinant.
is the discriminant not determinant.
thanks for the catch. I also failed to correct his "equations" for "solutions"
Must have been a Freudian slip
(that's when you say one thing, but mean your mother)
Must have been a Freudian slip
(that's when you say one thing, but mean your mother)