Question

15xsquared+37x+20 i got the binominal (15x+12)(15x+25)but when i factor it out it does not come out to formula

Answer 1

15x^2+37x+20
(5x+4)(3x+5)

Answer 2

that is what ur supposed to get when you factorize it

Answer 3

u want me to explain how i got that?

Answer 4

yea...thought i couldnt reduce the 15x+12 evenly with each other ok so heres another one i couldnt figure out..-21x^-20x-4 i thought it would be (-21x-14)(-21x-6) then to reduce to (-3x+2)(-21x-6) but its worng

Answer 5

ok umm ill teach you how i factorize ok :)

Answer 6

ok

Answer 7

so we have -21x^2-20x-4

Answer 8

-21squared-20x-4

Answer 9

yea so have a piece of paper at hand and write out the brackets one time like this

( )( )
and leave a space between then

Answer 10

k

Answer 11

out teacher taought us the x factor which i do understand but its when i use the postive and negitives and which side they go on i get confused..

Answer 12

well this is the only way i know it and it is the quickest way so ull benifit better using this method

Answer 13

next we'll do trial and error
u'll choose two multiples of 21 which when multiplied together you'll get back 21 so like this

(7x )(3x )

get it?

Answer 14

yes..so always use the 1st number to find multiples of?

Answer 15

the only other pair is
1 and 21
but since its trial and error we'll try 3 and 7 first :)

Answer 16

yep

Answer 17

k..so since its trial and error don't worry bout the order of the two or put the bigger one first

Answer 18

because when you expand the brackets u multiply those numbers so that is y they must get 21 when multiplied and since its x^2 those numbers have x's by then

Answer 19

correct :) u dont have to warry about the order :) ur getting the hang of it

Answer 20

k..so whats next dont have have find a number that adds up to 20

Answer 21

(7x )(3x )
next is the tricky part

Answer 22

the last two numbers must multiply together to get -4 and add together to get -20

Answer 23

so around here is when you start to look and where to put the negative and addition signs

Answer 24

this is the hard part....and confusing

Answer 25

sry i made a mistake plz forgive me its not add together to get -20

Answer 26

i was wondering how that was gonna equal -20

Answer 27

did your teacher ever teach you this