(x-8)(x+4)+(x-3)(x+9)
Remove parenthesis.
x-8+x+4+x-3+x+9
Then rearrange.
x+x+x+x+4+9-8-3
Now add/subtract.
4x+13-11
We still have combining to do...
4x+2
That's as far as it goes
---
hope it helps
