Search found 2 matches
Re: Gp
[quote="Stuart Kovinsky"][quote="vineetbatra"]This is a GP question. Formula is a*r^(n-1), where a is the first number, r is the constant and n is the number of times constant is applied I agree that the the answer should be 62, becuase with 63 the answer will be 1008.[/quote] So...
- by drian
Tue Jun 02, 2009 8:56 pm- Forum: Problem Solving
- Topic: Sequence
- Replies: 12
- Views: 2763
sum of roots
Please help, unsure as to - 2r1r2 part of equation, Thanks [quote="ontherocks27"]For a quadratic equation ax^2+bx+c = 0 Sum of roots r1 + r2 = (-b)/a Product of roots r1r2 = c/a For the given equation r1+r2 = (- (-1))/1 = 1 r1r2 = 1/1004 Now, r1^2 +r2^2 = (r1+r2)^2 - 2r1r2 = 1 - 2(1/1004) ...
- by drian
Sun May 31, 2009 8:24 pm- Forum: Problem Solving
- Topic: Roots of Quadratic
- Replies: 3
- Views: 1247