Question

144x^5 + 168x^4 + 48x^3 Use the foil method to factor. the answer is 3x(8x-1) (7x-1) .. i don't know how that is the answer, i see one part but the rest i'm confused

Answer 1

Hey I am not sure about foil method but can help you to factorize

Answer 2

ok

Answer 3

24x^3(6x^2+7x+2)
24x^3(6x^2+4x+3x+2)
24x^3(3x+2)(2x+1)

Answer 4

ok i did a long way i think i did x^3(12x ) (12x ) but i was confused further

Answer 5

Hey sorry I am not able to get the answer can you confirm the answer one more time

Answer 6

wait sorry bout that i did the wrong problem for that answer. the problem is 168x^3 - 45x^2 + 3x

Answer 7

ohh! so can you solve this or need my help?

Answer 8

need ur help the answer is 3x(8x-1) (7x-1) im confused on how to get this answer

Answer 9

k so lets do this step by step first take out the common 3x out we will get
3x(56x^2-15x+1) does this make sense?

Answer 10

not really now how do we get tht?

Answer 11

3x was common in all the terms so we can pull that out.
take an example
10+25
can be written as 5(2+5)

Answer 12

Let me know if it is clear now?

Answer 13

there it is clear

Answer 14

when i times 3 8 and 7 i get 168 right?

Answer 15

Yes
but do you know how to reach answer now?

Answer 16

It will really help if you can answer a bit fast :)

Answer 17

sorry its cos the hubby isn't giving me time to respond i have to cook while tryin to do my homework

Answer 18

:O you are married

Answer 19

anyway you need more help..or got the answer?

Answer 20

i was trying to multiply 8 and 7 which would give me 56 but

Answer 21

yeppy :)

Answer 22

Lets solve it from here 3x(56x^2-15x+1)

Answer 23

you know how to factorize quadratic equation?

Answer 24

just one sec how did you get the 15?

Answer 25

168x^3 - 45x^2 + 3x divide each term by 3x

Answer 26

so basically we are dividing and multiplying each term by 3x and we get 3x(56x^2-15x+1)

Answer 27

okay i see how you got 15 you divide 3 by 45 then divide 3 168 right?

Answer 28

right :)

Answer 29

so now we can this equation 3x(56x^2-15x+1)

Answer 30

lets factorize the quadratic equation

Answer 31

56x^2-15x+1

Answer 32

okay so we remove the 3x or

Answer 33

NO 3x will stay but we are doing question in parts. Once we find the solution for quadratic we will plug in everything.
know you have to find two numbers (a,b)such that a*b = 56 and a+b =-15

Answer 34

think what will be factors of 56

Answer 35

oh i see we factor it again right?

Answer 36

sorry I have to sleep now....I will tell you the steps you can have a look. In case you have doubts message me I will reply back with all your doubts.
so we had 3x(56x^2-15x+1)
this can be written as 3x(56x^2-8x-7x+1)
3x(8x(7x+1)-1(7x-1))
3x(8x-1)(7x-1)

Answer 37

Hope you understood..otherwise message me your doubts! GN

Answer 38

okay ill see if can figure it out thank so much for helping me :)

Answer 39

no problem :) have a look and message me if something is not clear

Answer 40

kk will tdo thanks :)