Answer: 
Step-by-step explanation:
The first thing you must remember is the mulplication of signs. You know that:

You can observe that the number inside the parentheses is positive (+) and the sign that is outside the parentheses is negative (-), therefore, when you multiply these signs you get a negative sign (-). Then you get:

Now, you need to add these numbers. And the result obtained is:

Answer:
6x(x+2)
Step-by-step explanation:
Factor 6x out of 6x^2+12x
6x(x+2)
Answer:
7x^15yz
Step-by-step explanation:
7(x^14x)y · z
7(x^14+1)y · z
7x^15yz
Answer:
x^2-6x, 4x^2-1x,10x^2+8x,15x^2-3xy
Just use the distributive property like you have before and you will get these answers, Hope this helped!