# i need help with these factor problems

• Nov 30th 2006, 08:41 PM
elfen_lied
i need help with these factor problems
i need help on factoring these the chapter is called "5-11 using several methods of factoring"

2x^4-162

25z^3-36y^2z

can you show how you did it to
• Nov 30th 2006, 08:46 PM
ThePerfectHacker
Quote:

Originally Posted by elfen_lied
i need help on factoring these the chapter is called "5-11 using several methods of factoring"

2x^4-162

$2x^4-162$
$2(x^2-81)$
$2(x^2-9^2)$
$2(x-9)(x+9)$

Quote:

25z^3-36y^2z
$25z^3-36y^2z$
$z(25z^2-36y^2)$
$z(5^2z^2-6^2y^2)$
$z[(5z)^2-(6y)^2]$
$z(5z-6y)(5z+6y)$
• Nov 30th 2006, 08:50 PM
elfen_lied
oh and i need help on this problem also

6x^2+22xy-8y^2

edit:and this

x^3-x+6x^2-6
• Nov 30th 2006, 10:39 PM
earboth
Quote:

Originally Posted by elfen_lied
oh and i need help on this problem also
6x^2+22xy-8y^2
edit:and this
x^3-x+6x^2-6

Hello,

I haven't much time, so I send you only the results:

$6x^2+22xy-8y^2=6x^2-2xy+24xy-8y^2$ $=2x(3x-y)+8y(3x-y)=(3x-y)(2x+8y)$

$x^3-x+6x^2-6=x(x^2-1)+6(x^2-1)=(x^2-1)(x+6)=(x+1)(x-1)(x+6)$

EB