math

Factorial notation problem. Please help?

Hi, I am stuck on this maths problem. Solve for n: (n+2)!/(n)! =110. I get as far as (n+2)(n+1) = 110. When I multiply it out I get n^2,3n,2 = 110. There is only one example similar to this in my book and it used a quadratic equation to solve it. I feel like that is the next step. I am just unsure of what to do with the 2 I have left over from multiplying out the binomial. I'm really sorry if this doesn't make sense. It's been several years since I had to study mathematics and I am really rusty. Any help is greatly appreciated.

  1. 👍 0
  2. 👎 0
  3. 👁 88
asked by Maria
  1. 110 = 2*5*11
    So, if n=9, (n+1)(n+2) = 10*11 = 110

    Or, algebraically,

    n^2+3n+2 = 110
    n^2+3n-108 = 0
    (n+12)(n-9) = 0
    n = 9,-12

    1. 👍 0
    2. 👎 0
    posted by Steve
  2. Yes I think it does make sense because
    n^2+3n+2 = 110
    n^2+3n-108 = 0
    (n+12)(n-9) = 0
    n = 9,-12 makes all of it come together ❤

    1. 👍 0
    2. 👎 0
    posted by Jay

Respond to this Question

First Name

Your Response

Similar Questions

  1. Maths

    Hey :) I'm sitting my maths non-calculator GCSE tomorrow and am currently revising. I'm doing a practise paper and am currently stuck on this question: Express A in terms of w. 3w + 20 A -------- = -------- 200 A + 12 -- What does

    asked by Sarah on May 17, 2009
  2. Child development

    Using these steps, consider a cognitive “problem” a young child might encounter that he/she needs help with (such as putting together a puzzle, sequencing – putting items in order, sorting by color or size, adding,

    asked by amy on October 14, 2011
  3. math

    . what are the steps to solve this problem? 0.000027/0.000009 requirements: explain how to use scientific notation to solve the problem describe how to divide written in scientific notation give your final answer in simplest form.

    asked by math help asap on November 12, 2014
  4. Math

    1. What are the steps to solve this problem? 0.000027 ÷ 0.000009 • Explain how to use scientific notation to solve the problem. • Describe how to divide numbers written in scientific notation. • Give you final answer in

    asked by anonymous on November 13, 2013
  5. Math

    1. What are the steps to solve this problem? 0.000027 ÷ 0.000009 Requirements: • Explain how to use scientific notation to solve the problem. • Describe how to divide numbers written in scientific notation. • Give you final

    asked by anonymous on November 14, 2013
  6. Physics

    this is the information i was given, it is confusing since the teacher didnt explain it at all... - speed of light = 3x10^8 m/s - 1nm= 10^-9 m the problem i have to solve is... A laser has a wavelength of 2.5 nm. What is the

    asked by Anonymous on June 13, 2018
  7. maths

    A survey o 85 students asked them about the subjects they liked to study 35 students liked maths,37liked history,26 liked physics,20 liked maths and history,14 liked maths and physics,2 liked all the subjects. a) how many of these

    asked by deepthi on January 28, 2015
  8. math,help

    i am stuck with this problem: Problem #12 Solve by using the quadratic formula. 5x^2 + 5x = 3 i am at this step x = (-5 (+/-) sqrt (85))/(10) you are done!

    asked by jasmine20 on April 15, 2007
  9. calculus

    hi, how do u solve this problem using limit notation. I tried it but go stuck at the last part. find f'(x) for f(x)=Sqrt2x-1 using F(x+h)-f(a)/h i got to the end and i got 1/Sqrt2x-1 -sqrt2x-1. i don't know wht u do next? am i

    asked by fred on March 4, 2008
  10. Math

    Could someone please help me with this math problem? Solve using the multiplication principle. Give the answer in set-builder notation. -4/5 less than or equal to -8x. I want to say that I multiply both sides by 5 but I'm not

    asked by B.B. on March 1, 2010

More Similar Questions