SOLUTION: Hi! I am completely stuck (doing homework) and could use a hand, please! Problem: 3x^3-5x^2-15 for x=3 I came up with: 3(3)^3-5(3)^2-15 3x27-5x9-15 81-45-15 solution = 21

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Hi! I am completely stuck (doing homework) and could use a hand, please! Problem: 3x^3-5x^2-15 for x=3 I came up with: 3(3)^3-5(3)^2-15 3x27-5x9-15 81-45-15 solution = 21      Log On


   

Question 248438: Hi!
I am completely stuck (doing homework) and could use a hand, please!
Problem:
3x^3-5x^2-15 for x=3
I came up with:
3(3)^3-5(3)^2-15
3x27-5x9-15
81-45-15
solution = 21
Am I close?
Thank you!!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct. 3%283%29%5E3-5%283%29%5E2-15=21