2x² + x - 3 = 2(x² + 0,5x - 1,5 ) = 2 (x² + 2 * 0,25x + 0,0625) - 0,125 - 3 =
= 2(x + 0,25)² - 3,125
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2x² + x - 3 = 2(x² + 0,5x - 1,5 ) = 2 (x² + 2 * 0,25x + 0,0625) - 0,125 - 3 =
= 2(x + 0,25)² - 3,125