Question

3x^2-12x+15... i completely forgot how to do these over the summer

Answer 1

I assuming you are factoring?

Answer 2

correct

Answer 3

factor out a 3 first 3(x^2-4x+5)

And that is about all you can do lol

Answer 4

for real? haha, i'm over thinking. gracias

Answer 5

well unless your teacher wants you to use imaginary numbers.. But I dont see that happening

Answer 6

no i dont think so. how about with cubes? like x^3+8^2-20x ?

Answer 7

well 8^2 is 64

x^3-20x+64

And I am pretty sure thats in factored form already

Answer 8

well my teacher wants it in ( ) ( ) ( ) form i believe

Answer 9

if you have a equation like a^n+bx+c and C is bigger than your B; and B is negative you cant factor into two equations with real numbers

Answer 10

i shouldnt have thrown all of my notes away.. haha

Answer 11

are yous rue you are copying down the problems correctly?

Answer 12

sure*

Answer 13

yeah, positive. she wants it factored by grouping, such as

x^3+2x^2-3x-6
factored would then be

(x^2-3)(x+2

Answer 14

yea that one is correct, but the two you have asked you can't factor further then what I showed unless you use imaginary numbers

Answer 15

ooooook, i see what your saying now. *lightbulb* haha

Answer 16

lol :P

Answer 17

thenhow about this one
4y^2-16y+15

Answer 18

(2y-3)(2y-5)

Answer 19

I find it easier to look at your last two numbers fist... in this case -16 and 15

you know the numbers have to multiply to be 15 and are going to add to a negative number

so your option are -1 and - 15

and -3 and -5

since you have 4y^2 it wont be -1 and -15 so you can toss that out.. then you try -3 and -5

with different variation of 4y^2 which will either be 2y * 2y or 4y* y..which leaves you with (4y-3)(y-5) or (2y-3)(2y-5) then you just foil and see which one gives you what you wnat. There are easier ways to figure it out but I have always done it by trial and error of something doesn't immediately pop out at me