SOLUTION: If {{{a-b = -6}}} and {{{b + c = 9}}}, find the value of {{{3a^2 - b^2 - 2c^2}}}

Algebra ->  Equations -> SOLUTION: If {{{a-b = -6}}} and {{{b + c = 9}}}, find the value of {{{3a^2 - b^2 - 2c^2}}}      Log On