Group Terms: Group the terms to find common factors.Group the first two terms and the last two terms separately.18y3+9y2−20y−10 can be written as (18y3+9y2)−(20y+10).
Factor Common Factors: Factor out the greatest common factor from each group.From the first group 18y3+9y2, we can factor out 9y2, which gives us 9y2(2y+1).From the second group 20y+10, we can factor out 10, which gives us 10(2y+1).Now we have 9y2(2y+1)−10(2y+1).
Factor Greatest Common Factor: Factor out the common binomial factor.Both groups now have a common factor of (2y+1).Factor out (2y+1) from both groups.The expression becomes (2y+1)(9y2−10).
Factor Common Binomial: Check if the quadratic can be factored further.The quadratic 9y2−10 does not factor nicely with integer coefficients, so it is already in its simplest form.