Frequent Questions about our Solver

The problem

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I do not understand where the y^2 - 3y+7y -21=0 came from. Where are the 3y and 7y from?

Answer provided by our tutors

We need to factor this trinomial by grouping.

The first step in this process consists of splitting the middle term into two terms.

In your case "4y", has been split into "7y - 3y". 

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