Question

4(r - 7/2)^2 - 40

19. Use the discriminant to find the number of unique real solutions.

20. Solve with the quadratic formula

Answer 1

u still want me to explan the first part or u understand wat i did?

Answer 2

Sorry, accidentally closed the other one. And no, I understand it. I looked over your steps. I just need help with the rest

Answer 3

wats the original equation again?

Answer 4

4r^2 - 28r = -49

Answer 5

the discriminant is b^ - 4ac

Answer 6

b^2 - 4ac

Answer 7

Yea, I know that

Answer 8

i can help u with number 20 but wat i do with number 19 is a guess :/

Answer 9

Any answer is better than mine, to be honest haha. I'm trying to finish this up because I'm not feeling well.

Answer 10

for number 19 wat i did was plug in values to get (-28)^2 - 4 (4) ( 48) and the answer u get is 0 which means that their r 0 real roots.

Answer 11

Alright, looks fine to me

Answer 12

lol that's my educated guess lol

Answer 13

Haha, like I said - any answer is better than mine.

Answer 14

so on to number 20, u know how to use the quadratic formula?

Answer 15

No clue :b

Answer 16

ok but u know wat the quadratic formula looks like right?

Answer 17

Yeah, some what

Answer 18

the discriminant is b^2+4ac

Answer 19

yea but how do u use it to prove the number of unique real solutions.

Answer 20

my gues was
for number 19 wat i did was plug in values to get (-28)^2 - 4 (4) ( 48) and the answer u get is 0 which means that their r 0 real roots.
do you know for sure how?

Answer 21

the quadratic formula is
x = -b\[x=\frac{ -b \sqrt[\pm]{b ^{2}-4ac} }{ 2a }\]

Answer 22

What? haha

Answer 23

number 20! lol

Answer 24

I know I was reading it haha!

Answer 25

so wat u do is plug a= 4, b= -28, c= 49

Answer 26

Right

Answer 27

so work thst out and ur done with number 20 :P

Answer 28

Alrighty, thank you for all of your help. I would've been up all night, and I need to get rest for work tomorrow haha!

Answer 29

ok gn :)