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OpenStudy (anonymous):
What is the value of b2 - 4ac for the following equation? 2x2 - 2x - 1 = 0
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OpenStudy (campbell_st):
well you would have b = -2, a = 2 and c = -1 so \[b^2 - 4ac = (-2)^2 - 4 \times 2 \times -1\]
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