M Max CR New member Joined Jul 2, 2008 Messages 2 Jul 3, 2008 #1 Why is it that 9x^2+36 becomes 9(x^2 - 4y^2)? Why doesnt it get factored similiar to the example below. 6c^2 - 600 becomes 6(c+10)(c-10)
Why is it that 9x^2+36 becomes 9(x^2 - 4y^2)? Why doesnt it get factored similiar to the example below. 6c^2 - 600 becomes 6(c+10)(c-10)
G galactus Super Moderator Staff member Joined Sep 28, 2005 Messages 7,203 Jul 3, 2008 #2 It doesn't. There is a problem somewhere.
X Xelthen New member Joined Jul 2, 2008 Messages 2 Jul 3, 2008 #3 I think he means 9x² + 36y² It's because you factor out the 9 so it becomes 9(x² + 4y²), but x² + 4y² can't be factored.
I think he means 9x² + 36y² It's because you factor out the 9 so it becomes 9(x² + 4y²), but x² + 4y² can't be factored.
D Denis Senior Member Joined Feb 17, 2004 Messages 1,700 Jul 4, 2008 #4 Moral of da story: a^2 - b^2 = (a + b)(a - b) a^2 + b^2 = a^2 + b^2 :roll:
