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Mathematics 23 Online
OpenStudy (anonymous):

7w^2+30w+8 = ??

OpenStudy (anonymous):

(7w + 2)(w + 4)

OpenStudy (anonymous):

30w where is come from ?

hero (hero):

7x^2+30x+8 7x^2 + 28x + 2x + 8 7x(x+4)+2(x+4) (x+4)(7x+2) Substiute x for w

OpenStudy (anonymous):

wow .. i love u man ..

hero (hero):

I'm amazed that you understood it

OpenStudy (anonymous):

its easy .. thx bro

hero (hero):

Okay. Do you have another one?

OpenStudy (anonymous):

27x^6 + 64y^3 = ?

OpenStudy (anonymous):

i dont know .. :\

hero (hero):

I thought it was easy

OpenStudy (anonymous):

no its not .. ;p

hero (hero):

There is an invisible b term that you have to split it into

OpenStudy (anonymous):

whaaaat !!!!!

OpenStudy (anonymous):

the q is simplify

hero (hero):

yes, that's part of simplification

OpenStudy (anonymous):

so how can i simplify it ?

hero (hero):

Just a sec

OpenStudy (anonymous):

i think i can do it ..

hero (hero):

Okay, go ahead

OpenStudy (anonymous):

(3x^2)^3 + what if i say .. let x^2 = y and let g^3 = m so i have .. 3y^2 + 64m is thay right ?

hero (hero):

You should probably consult the sum of cubes formula

OpenStudy (anonymous):

but i dont know what after that .. ;p

OpenStudy (anonymous):

ummm .. (3x^2 + 4g) × (9x^4 - 12xg +16g^2) is that right ?

OpenStudy (anonymous):

herroooo

hero (hero):

Yes, that's right

hero (hero):

What were your steps?

OpenStudy (anonymous):

27x^6 = (3x^2)^3 and, 64g = (4g)^3 so i have .. (3x^2)^3 + (4g)^3 = (3x^2 + 4g) × (9x^4 - 12x^2g +16g^2)

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