Question

Given the function h(c)=8c2−41c, solve for h(c)=42.

Give an exact answer; do not round.
(Use a comma to separate multiple solutions.)

Answer 1

@AZ

Answer 2

az

Answer 3

help? i need it

Answer 4

Can you use desmos?
Or....?

Answer 5

graphing calculator or scientific calculator

Answer 6

or matrix calculator

Answer 7

I recommend desmos

Answer 8

but desmos has different calculators

Answer 9

You can put in
8c^2 -41c
and also
y=41

The two points that get intersected are the points

Answer 10

az left?!

Answer 11

am i not enough?

Answer 12

your more!!!!!!!

Answer 13

*you're

Answer 14

41 is the anser?

Answer 15

https://www.desmos.com/calculator/ytpfqxw2ys

Look at the points of intersection

Answer 16

i cnat see it

Answer 17

"cnat"

Answer 18

I suggest scrolling up in the graph

Answer 19

There are two points of intersection, one negative, one positive, look up

Answer 20

See those points of intersection?

You can also click on them, and it'll tell you the exact coordinate

Answer 21

Or, we could also do this a different way, we can use the quadratic formula:)))))
Do you want to do that

Answer 22

-0.8, and 6

Answer 23

There's something after -0.8
It's -0.85

Answer 24

Do you want to redo this and do it using the quadratic formula? it's nice practice

Answer 25

alright

Answer 26

Kay
Do you know the quadratic formula?

Answer 27

i only kno a small amount

Answer 28

We have
42 = 8c^2 -41c
Because we want it all on one side, we do
8c^2 -41c -42

Answer 29

Yea?

Answer 30

yep

Answer 31

Okay, so now we plug it in:)

Answer 32

Look at the screenshot, and remember the a, b, and c, are from ax^2 + bx+c, aka, 8c^2-41c-42

Answer 33

So, first part,
-b

What is b, what is -b?

Answer 34

-0.85?

Answer 35

we have ax^2 + bx+ c
8c^2 -41c-42

a=8
b= -41
c= -42

Answer 36

alright oh i see

Answer 37

So, plug it in, first step
-b
What is it

Answer 38

-41

Answer 39

b=41
what is -b

Answer 40

im not sure

Answer 41

What is -(-41)

Answer 42

41

Answer 43

Okay
next step
sqrt(b^2 -4ac)
What is b^2, remembering that b is -41

Answer 44

-41^2

Answer 45

So what does that equal to

Answer 46

-1681

Answer 47

._.
Why would it still be negative

Answer 48

1681

Answer 49

Okay, and what is 4ac
4 times a times c

remembering that a is 8, c is -42

Answer 50

4 * 8 * -42

Answer 51

So what does that equal to

Answer 52

1344

Answer 53

Why did you get rid of the negative sign._.

Answer 54

-1344

Answer 55

Kk, so then what is 1681-(-1344)

Answer 56

3025

Answer 57

Okay, so now we got 41 +- sqrt3025
now we gotta do the denominator
2a
a is 8
What is 2a

Answer 58

16

Answer 59

Kay
So it is
(41 +- sqrt3025)/16
Can you tell me what sqrt 3025 is

Answer 60

55

Answer 61

Okay, nowww we got to the part where we have to do two equations
(41+55)/16
and
41-55)/16

Can you tell me what are the results of both

Answer 62

96 and -14

Answer 63

They have to be divided by 16...
What is 96/16 and -14/16

Answer 64

6 and -0.875

Answer 65

There are your 2 answers!

So, in the future, you can do it the graphing method or use the quadratic formula

Answer 66

graphing method!!!!!!!!!!!!!

Answer 67

ho do i graph this Given the function h(a)=9a2+46a, solve for h(a)=−5.

Answer 68

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