Question

MCR Help please :)

Answer 1

https://gyazo.com/7b3566a457ad8512165db25324437c83

@mathmale

Answer 2

just replace h by 11
and solve the quadratic equation

Answer 3

@xapproachesinfinity I tried that, and obviously did it wrong, I got 2.06

Answer 4

so you did 1+25t-t^2=11

Answer 5

Well for me the 11 was on the other side and then I put everything onto the side with the 11.

Answer 6

yeah it is the same

Answer 7

so you got -10+25t-t^2=0

Answer 8

No, I moved everything to the side with the 11, so I got 10-25t+5t^2

Answer 9

yeah the same thing don't worry

Answer 10

so that is good what did you do after that

Answer 11

I put it into the t=-bsqrtb^2-4ac/2a formula

Answer 12

Ok quadratic formula

Answer 13

so what is the problem

Answer 14

I got the wrong answer lol

Answer 15

well you probably doing the numbers incorrectly

Answer 16

but the method is good

Answer 17

When I put the numbers in I did

t=25+sqrt(-25)^2-4(5)(10)/2(5)

Answer 18

should be good

Answer 19

are you including plus or minus

Answer 20

What do you mean?

Answer 21

the quadratic formula always has Plus or minus in middle

Answer 22

so there are two answers no just one

Answer 23

Oh -b+-sqrt

Answer 24

yeah

Answer 25

Give me a second

Answer 26

ok

Answer 27

So would it be 2.06 or -2.06

Answer 28

it gotta be the positive answer

Answer 29

you said your answer was wrong?

Answer 30

are you rounding correctly

Answer 31

2.06 is to the hundredth right?

Answer 32

seems so

Answer 33

what is the actual number you get

Answer 34

2.0615528128

Answer 35

hmm ok

Answer 36

let me see what you are doing wrong

Answer 37

Well it says "If there is more than one answer, use the "or" button."

Answer 38

But Im afraid to submit another answer until we know for sure because if I get it wrong one more time it moves me onto the next one

Answer 39

ok

Answer 40

seems there are two but you are getting a negative

Answer 41

hold on

Answer 42

I got 4.56 and 0.44

Answer 43

i don't know how you getting 2.06

Answer 44

Me neither, Im super tired, but this has to be done, I just finished a 1000 word essay for English. Ill try your answer and see if it works I guess

Answer 45

You are probably using the formula in wrong way

Answer 46

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

Answer 47

is that what you are using?

Answer 48

Yes

Answer 49

well I got those answers
\[x=\frac{25\pm\sqrt{(-25)^2-4(5)(10) }}{2(5) }\]

Answer 50

Did you multiply 5 and 10 first

Answer 51

Well, before multiplying by -4 I mean, not as in the very first thing

Answer 52

it does not really matter
you get for that -200 anyway

Answer 53

so under radical you have 625-200=425

Answer 54

Yeah I got that

Answer 55

you square root that you get
20.61552812...

Answer 56

Mhmm

Answer 57

Ohhhhh, yep I did it wrong

Answer 58

Oops :P

Answer 59

so what were you doing?

Answer 60

I wasnt adding 25, I was just dividing the square root of that number by 10

Answer 61

yeah you should add 25 first

Answer 62

Whoops :3

Answer 63

you got carried away

Answer 64

well the answers are two not just one

Answer 65

True, how'd you get .44

Answer 66

because the ball will go upward and come down

Answer 67

so it two different timings it will be at 11 meters

Answer 68

you got use comma as they suggested

Answer 69

I'm still confused on how you got .44

Answer 70

oh how did i get 044
because 25-20,61 and then divide by 10

Answer 71

Ohhhh, alright, that makes sense

Answer 72

remember it plus or minus
one is to add and one is to subtract

Answer 73

Well I will probably have about 3 problems after this one, if I have troubles can I tag you in another question?

Answer 74

Try sketching this function.