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a=-2 b=4 c=? q=4
-Δ / 4a = 4
- (b² - 4ac ) / 4a = 4
- ( 4² - 4*(-2)*c) / 4*(-2) = 4
- (16 + 8c ) / - 8 = 4
16+8c / 8 = 4 /*8
16+8c = 32
8c = 32 - 16
8c = 16 /:8
c=2