It is the dreaded algebra again. i am stumped. factor the four-term polynominal by grouping. factor completely. 15x³ - 9x² + 25x - 15 =

So, first let’s take the first 2 numbers.

In these, both can factor out 3x squared.

In the second 2, we can take out 5.

So we have:

3x squared(5x-3) + 5(5x -3)

Now we can take out 5x-3.

So,

(5x-3)3x squared + 5.
Now we put 3x squared + 5 in brackets.

Final (5x-3)(3x squared -5