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edexcel core mathematics c2 answers - 3 = 0 \). Use quadratic formula: \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] where \( a=2 \), \( b=-5 \), \( c=-3 \). Calculate discriminant: \[ \Delta = b^2 - 4ac = (-5)^2 - 4 \times 2 \times (-3) = 25 + 24 = 49 \] Find roots: \[ x = \frac{-(-5) \ E Edd Kertzmann Jan 24, 2026
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