Question

Multiply (x − 4)(x2 − 3x + 5)

x3 + 5x2 + 5x − 20

x3 + 2x2 + 8x − 20

x3 − x2 + 7x − 20

x3 − 7x2 + 17x − 20

Answer 1

(x − 4)(x2 − 3x + 5) X = 4
x3 + 5x2 + 5x − 20 X = 1.418 assuming x3 means X^3
x3 − x2 + 7x − 20 X = 2.12 also assuming X3 means X^3
x3 − 7x2 + 17x − 20 X = 4 assuming X3 menas X^3
do you know how i did this?

Answer 2

np

Answer 3

I can give u metal if i don't know the answer

Answer 4

I can not

Answer 5

Hi. So do this, we need to foil. Let's separate both equations:
(x) * (x^2-3x+5)
Now distribute the x. Do you know how to do that?

Answer 6

let me try it

Answer 7

so will be x^2-3x^2+5x

Answer 8

Almost, remember that x*x^2=x^3, but everything else is right. :)
Now the second one:
-4*(x^2-3x+5)=?

Answer 9

4x^2+12x-20

Answer 10

so the final answers is x^2-7x+17x-20

Answer 11

Now remember the - in -4x^2
x^3-3x^2-4x^2+5x+12x-20
The final answer is
x^3-7x^2+17x-20
You got the answer right, just don't forget the ^signs :)

Answer 12

thank you help me on this one last one

Answer 13

Simplify (8j3 + 5j2 − 3) − (5j3 + 7j2 − 12j + 7)

3j3 + 12j2 − 15j + 10

3j3 + 12j2 + 12j + 4

3j3 − 2j2 + 12j − 10

3j3 − 2j2 − 12j + 4

Answer 14

so first we need to distribute the negative:
-(5j3+7j2-12j+7)=?

Answer 15

change the sing

Answer 16

Yes, when you distribute a negative, you basically change the sign to the opposite sign

Answer 17

-5j^3-7j^2+12j-7

Answer 18

Yes, now put the whole question together:
8j3+5j2-3-5j3-7j2+12j-7
Now combine like terms. What will be the final answer?

Answer 19

3j^3-2j^2-15-7

Answer 20

3j3 is right, -2j2 is right, but if you notice in the problem, there is only 12j, there's no like term to combine that with, but -3 and -7 equals -10, so it will be
3j^3-2j^2+12j-10
Do you understand it?

Answer 21

thanks what about this one

Rationalize the denominator of square root of negative 16 over open parentheses 1 plus I close parentheses plus open parentheses 6 plus 3 i

quantity of negative 16 plus 28 I over 33

quantity of 16 plus 28 I over 65

quantity of negative 12 plus 28 I over 40

quantity of 12 plus 28 I over 58

Answer 22

Can you draw out the question so I can have a better view of how it looks?

Answer 23

ok\[\sqrt{-16}/((1+i)+(6+3i)\]

Answer 24

I don't know how to write it correctly

Answer 25

Thank you. First thing we need to do is to simplify the denominator:
1+i+6+3i
Combine like terms
1+i+6+3i=?

Answer 26

7-3i^2

Answer 27

It should be 7+4i because we are adding 3i and i.

Answer 28

ok then what?

Answer 29

Next, we simplify the top part. sqrt of 16 is 4, but because 16 is negative, the answer will be 4i.
Now to rationalize the denominator, we have multiply the top and bottom by the conjugate of (7+4i), which is (7-4i)

Answer 30

So we start with the top one:
4i(7-4I)
Distribute the 4i,
equals ?

Answer 31

28i-16i^2

Answer 32

It seen that you love math with<3

Answer 33

Yes. Now the bottom:
This time we foil
(7+4i)(7-4i)=
49-28i+28i-16i^2
Now the simplify
=?
and yeah I love math lol

Answer 34

so final answers is 16+28/33

Answer 35

hey I an working on this assignment seen two moth and i can figurative out can you make a look at it I will really appreciated. thank you and god bless you.

Answer 36

Well, the top we have
28i-16i^2,
and I^2 means (-1), so -16*-1 equals 16,
and the bottom is
49-16i^2
which is becomes 49+16
So let's put it all together:
28i+16/65
so the answer will be b

Answer 37

i got it thanks can you check what i send you:(

Answer 38

Ok so I'm looking through it, and for number 1 c,
it should be
x^3+3x^2+9 instead of x^2+3x^2+9

Answer 39

So I'm not sure for the rest of them. Sorry :(

Answer 40

ok don't worry
thank for your help when i need help can I sen you a message

Answer 41

Yeah :)

Answer 42

:)

Answer 43

@tHe_FiZiCx99 there's a link for the document that has the questions on it up.

Answer 44

Which question is it?

Answer 45

:/

Answer 46

Number 3 on the document. The one about grouping method.

Answer 47

Are you suppose to pick from certain factoring methods? I use the Christmas tree method to factor but when you'e doing quadratics there's a better method, don't remember the name though.

Answer 48

ok here is the Hw with no numbers this is what the teachers gave me

Answer 49

I do't know confuse:/

Answer 50

@yulima How about I message you the answer after I ask my brother about it? He knows more about math than me :P

Answer 51

ok i really appreciated.

Answer 52

:)