You can put this solution on YOUR website!
Recognize in your problem 81s^2-144s+64 that 81 and 64 are perfect squares.
Also recognize that the middle term is negative, while the last term is positive. In order to achieve a negative sum and positive product, both constants have to be negative... for instance -3 * -3 = 9, and -3 + -3 = -6.
Given this information, we have all we need to solve this.
Remember 81s^2 = (9s)^2 , so our first term in our factor will be 9s.
Similarly with 64 = 8^2.
So our factorization will be
Let's FOIL to make sure.
Hope this helped!