Question

help please
What is the discriminant of the given equation?
X^2-2x+4=0
A. -12
B. 0
C. 20
D. 12

Answer 1

@phi

Answer 2

do your notes tell you what the discriminant is ?

Answer 3

yes , here is what it said.
The discriminant is the name given to the expression that appears under the square root (radical) sign in the quadratic formula. The discriminant tells you about the "nature" of the roots of a quadratic equation given that a, b and c are rational numbers.

Answer 4

@phi

Answer 5

do you know what is the formula of discriminant ?

Answer 6

D = b^2 -4ac

yes ?

Answer 7

yes, Discriminant of a Quadratic. The number D = b2 – 4ac determined from the coefficients of the equation ax2 + bx + c = 0. The discriminant reveals what type of roots the equation has. Note: b2 – 4ac comes from the quadratic formula.

Answer 8

yes right so what you need to know than about it ?

Answer 9

how to find the answer

Answer 10

so you know that D = b^2 -4ac

in this case of your exercise

a= ?
b=?
c= ?

Answer 11

ax^2 +bx + c = 0

how is this in case of this posted quadratic ?

Answer 12

0

Answer 13

x^2 -2x +4 = 0

so can you tel me now how many is a,b and c equal ?

Answer 14

so a= 1 bc. there is 1x^2
yes ?

Answer 15

please collaborate

Answer 16

a=1
b=2
c=4

Answer 17

b not is 2

Answer 18

bc than you write just 2 so tis mean +2 but there is -2
yes ?

Answer 19

so now than you know these values of a,b and c so you can calculi easy the value of discriminant
yes ?

Answer 20

so it would be c right

Answer 21

you now have the information needed

a=1
b=-2
c=4

all you need to do is put those numbers into the expression
D = b^2-4ac

when you have worked out that value that is the answer