I am having trouble with a couple of questions in terms of the proccess of solving the questions:

1If x-3 is a factor is x^2+ax+b, then 3a+b+10 equals?

2The x-axis intercepts of the graph with equation y=(x+a)^2(x^2-b^2), where a and b are positive constants are?

I will be greatly apprecieated if any of you would have the time to help and explain these questions for me.