Question

5x2+7x-3=0 wats te discriminant

Answer 1

huh

Answer 2

so how do u find if it is a real or imaginary

Answer 3

\[ ax^2+bx+c\]\[Discriminant = \,b^2-4ac. \]

Answer 4

so how do i find it with tthat only
and how is it real or imaginary

Answer 5

well in your question a = 5, b = 7 and c = -3

substitute and evaluate

Answer 6

oh so the a will be 5

Answer 7

put u dont have to take out the five and put it into a diffrent equation

Answer 8

not quite... I think you need to try again...

Answer 9

oh ok thank u that was really helpful bro

Answer 10

wait so whats real and imaginary mean

Answer 11

ok ithe calculation is

\[7^2 - 4 \times 5 \times (-3) =\]


if its greater than zero it has real roots

if its equal to zero it has 1 repeated root

is it less than zero then you complex roots...

Answer 12

oh i get it thanks u mind when i need help i can ask u bro

Answer 13

thats ok... if I can do it

Answer 14

lmao thanks bro

Answer 15

i have another quetsion

Answer 16

ok

Answer 17

ok i solved another question and i got 0 but it says to write if it is a real number tell weather they will be ration or irrational how would i do that im confused

Answer 18

ok.... so if you get a zero value the quadratic is a perfect square...

whats the equation...?

Answer 19

so would that be a real number so is it rational or irrational

Answer 20

here is an example

y=x^2 + 6x + 9 or y = (x + 3)^2

has a repeated root at x = -3

and the discriminant is 36 - 36 = 0

Answer 21

ok so is it rational or irrational

Answer 22

so a parabola such as

\[y=x^2 - 6x + 5 ....= (x -5)(x -1) \]

has roots at 1, 5

the discriminant 36 - 20 = 16

16 is a perfect square so the parabola has 2 unequal roots that are real and rational....

if you think about your original question

the discriminant was 109.... which means 2 unequal real roots which are irrational as 109 isn't a square number.

Answer 23

oh ok so an unperfect square is a irrational and a perfect square would be rational

Answer 24

ok so x2 would be a=1 right

Answer 25

yes... as long as its >0

Answer 26

ok y that face

Answer 27

good luck

Answer 28

lmao thanks ur great help bro