If a^4+a^2 b^2 + b^4 = 8 and a^2 + ab + b^2 = 4, then the value of ab is

(A) -1 (B) 0 (C) 2 (D) 1

Printable View

- June 16th 2013, 04:12 AMsscgeekAlgberic question
If a^4+a^2 b^2 + b^4 = 8 and a^2 + ab + b^2 = 4, then the value of ab is

(A) -1 (B) 0 (C) 2 (D) 1 - June 16th 2013, 05:18 AMTrefoil2727Re: Algberic question
- June 16th 2013, 05:38 AMProve ItRe: Algberic question
From the first equation:

and from the second equation:

Substituting into the first equation gives

- June 16th 2013, 08:39 AMSorobanRe: Algberic question
Hello, sscgeek!

Quote:

. .

. . . . . . . . . .

. . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . .