D debbie29 New member Joined Jul 19, 2005 Messages 14 Aug 19, 2005 #1 The question: 3x^7y^2+ 24xy^8 So far I have: 3x*y^2(x^6 + 8y^6) 3x*y^2(x^6 + 8y^6) =3x*y^2( (x^2)^3 + (2*y^2)^3 ) After that point, I'm stuck. What do I do?!?!?!
The question: 3x^7y^2+ 24xy^8 So far I have: 3x*y^2(x^6 + 8y^6) 3x*y^2(x^6 + 8y^6) =3x*y^2( (x^2)^3 + (2*y^2)^3 ) After that point, I'm stuck. What do I do?!?!?!
stapel Super Moderator Staff member Joined Feb 4, 2004 Messages 16,579 Aug 19, 2005 #2 Apply the sum-of-cubes formula. . . . . .a<sup>3</sup> + b<sup>3</sup> = (a + b)(a<sup>2</sup> - ab + b<sup>2</sup>) Eliz.
Apply the sum-of-cubes formula. . . . . .a<sup>3</sup> + b<sup>3</sup> = (a + b)(a<sup>2</sup> - ab + b<sup>2</sup>) Eliz.
