Polynomials: Factoring

Today we learned that as we can develop the question we must be able to do it backwards.

In this case we factored the question back to a simpler state.  Solving this question is focusing on the 2x and the -5

I factor starting with 2 multiplying 5 making 10, then from 10 we determine how to get 9; which in this case is only 1 and 10 as its factors

so we put down (2x-1)(2x+10)

then simplying the 2 and the 10

=(2x-1)(x+5)