SOLUTION
The given expression is
The general trinomial expression is,
Therefore,
Let us look for the factors of -20 and also confirm if the factors will give 8 as the sum.
Therefore, the two factors are -2 and 10.
Let us now replace 8x with -2x and 10x in the expression given
Break the expression into two groups
Factor out the common terms
Factor out the common term 2x - 1
Hence, the answer is