2008-09-23, 12:51 AM
Okay... here's basically what you need to know.
Difference of squares: m^2 - n^2 = (m+n)(m-n)
Difference of cubes: m^3 - n^3 = (m-n)(m^2+mn+n^2)
Sum of cubes: m^3 + n^3 = (m+n)(m^2-mn+n^2)
Basically what butterfli said. m and n can be anything. In the case of the first one m = p+q and n = p-q.
Can you do the second one from here or you need help?
Difference of squares: m^2 - n^2 = (m+n)(m-n)
Difference of cubes: m^3 - n^3 = (m-n)(m^2+mn+n^2)
Sum of cubes: m^3 + n^3 = (m+n)(m^2-mn+n^2)
Basically what butterfli said. m and n can be anything. In the case of the first one m = p+q and n = p-q.
Can you do the second one from here or you need help?