Answer:
9x^2 -3x - 20
Step-by-step explanation:
Trinomials are a type of polynomial expressed by three terms seperated by + or -.
Im assuming you meant to write (3x+4)(3x-5). The sign didnt appear.
You have to distribute. The rule for distributing two binomials or multiply them together is the following: (ax+b)(cx+d) = ax*cx + d*ax + b*cx+ b*d. You simply multiply each term of the first bracket by each term of the other and include their respective signs and vise versa.
So for here (3x+4)(3x-5) would be 3x*3x -5*3x + 4*3x +4*-5
This gives 9x^2 -15x + 12x -20
Combine all the like terms and you get
9x^2 -3x - 20
Hope that answers your question
