Question

am trying to factorize 2x^2+9x+4 i.e what can add up to 9 and multiply to be 4

Answer 1

that is not what you need. You need what times to 8 and adds to 9

Answer 2

Don't forget the 2 before the x^2

Answer 3

what you wrote would be right if there was no 2 by the x squared

Answer 4

so this is how its done

Answer 5

\[2x ^{2} +9x +4\]

Answer 6

i mean what can add up to be 9 and multiply to be 4 . this is the question factorize 2x squared+ 9x+ 4x

Answer 7

exactly that is what i meant to write

Answer 8

times the 2 (coefficient) by the constant: 2 times 4 = 8

Answer 9

now take the coefficient of the middle number: 9

Answer 10

ask your self: What times to 8 and adds to 9: 8 and 1 right?

Answer 11

now write it as binomials but remembering the original coefficient:
(2x+8)(2x+1)

Answer 12

BUT WAIT

Answer 13

since the first binomial has a common factor of 2 you must divide it by that
(2x+8)
----- = (x+4)
2

Answer 14

so factors are (x+4) (2X+1)

Answer 15

thanks so much i got it and i understand it now

Answer 16

Great,

Answer 17

my itunes or android app shows this in video form: www.takebackmath.com

Answer 18

if you want to see it taught

Answer 19

isnt it right if write it this way (2x+1) (x+4) bcs it actually gave me the same thing

Answer 20

yes that is just the same thing write in different order, remember communicative property: a times b = b times a, they give the same answer

Answer 21

ok great

Answer 22

you could be a great help to me bcs to honest my foundation in math is really bad , i am currently taking pre calculus now and i had dropped it for grade w for tow semesters now but this semester i decided to get it done but still having problem in getting it

Answer 23

if you are still there to factorize x^2+2x-2 isnt it (x+2) (x-4)

Answer 24

x^2+2x-8 rather

Answer 25

okay

Answer 26

for this since there is no number beside the x squared you want want times to -8 and adds to 2: 4 times -2
so the factors are (x+4)(x-2)