BuyFind

Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071
BuyFind

Precalculus: Mathematics for Calcu...

6th Edition
Stewart + 5 others
Publisher: Cengage Learning
ISBN: 9780840068071

Solutions

Chapter 1.5, Problem 42E
To determine

Solve the equations for n .

Expert Solution

Answer to Problem 42E

  n=1±1+8S2

Explanation of Solution

Given information:

  S=n(n+1)2

Formula used:

  • Transposition of terms.
  • For ax2+bx+c=0

      x=b±b24ac2a

Calculation:

  S=n(n+1)22S=n2+nn2+n2S=0

Using quadratic formula to find the value of u

  n=b±b24ac2an=1±124(1)(2S)2(1)n=1±1+8S2

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