Question

What is the discriminant of 9x2 + 2 = 10x?
A:–356
B:–172
C:28
D:72

Answer 1

@ParthKohli

Answer 2

@SarthKohli

Answer 3

Discriminant is \[b^2-4ac\] where your equation is of the form \[ax^2+bx+c=0\]

Answer 4

What do you think the answer is? @seanzilla

Answer 5

welcome to openstudy!!
follow the directions given by @Astrophysics above

Answer 6

put in the general format
identify your values for a, b, c
substitute and compute

Answer 7

Maybe lets put your equation in a better form so we can compare it to \[ax^2+bx+c=0\]
\[9x^2+2=10x \implies 9x^2-10x+2=0\] try now

Answer 8

Oh okay i understand the answer is 28! C!

Answer 9

Well done! :)

Answer 10

Nice work.
Can you teach these to me afterwards @Astrophysics

Answer 11

Why don't I get a MEDAL? HM???????????????????????????????????

Answer 12

cause u didn't help xD @browniecat

Answer 13

lol thanks for the 3 medals

Answer 14

Keep em comin

Answer 15

D=\[b ^{2}-4ac\]

Answer 16

\[9\times2+2-10x=0\]

Answer 17

here,
a=18
b=-10x
c=2

Answer 18

\[D= (-10x)^{2}-4(18)(2)\]

Answer 19

\[100x ^{2}-144\]

Answer 20

\[100x ^{2}=144\]

Answer 21

\[x^{2}=\frac{ 144 }{ 100 }\]

Answer 22

\[x=\sqrt{1.44}\]