How should I start expanding two quadratics? Do I factor and then do it the long way?
(x^2-6x+9)(x^2+8x+13)
bird wrote:How should I start expanding two quadratics? Do I factor and then do it the long way?
bird wrote:(x^2-6x+9)(x^2+8x+13)
start like this:
x^2 - 6x + 9
x^2 + 8x + 13
------------------
first multiplication:
x^2 - 6x + 9
x^2 + 8x + 13
--------------------
13x^2 - 78x + 117
second multiplication:
x^2 - 6x + 9
x^2 + 8x + 13
------------------------
13x^2 - 78x + 117
8x^3 - 56x^2 + 72x