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( 2x +1) ( x - 3) =0
x = -1/2 x = 3
a= -1/2 b = 3
1/a² + 1/b² = 1/ (-1/2)² + 1 / 3²
= 1/ (1/4) + 1/9
= 4 + 1/9
= 37 / 9