SOLUTION: I am not quite sure the name of this kind of problem because I am still new at this, but if someone could help me I would really appreciate it. This is the problem. It states:

Question 150221: I am not quite sure the name of this kind of problem because I am still new at this, but if someone could help me I would really appreciate it. This is the problem. It states:
Multiply (7x+4)(7x^2+5x+4)
I get confused when it comes down to the steps and I would really appreciate the help. Thank you so much.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
(7x+4)(7x^2+5x+4)
Remember to use the distributive property.
To make it simpler, use a substitution.
Let A=7x+4.

That's pretty straight forward.
Now substitute the original value.

Take each term and use the distributive property,

Now put all the parts together,

Combine all like terms

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