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Use the quadratic formula to solve a quadratic equation. [Edexcel IGCSE Jan2013-4H Q18 Edited] Solve
5
x
2
+
2
x
−
4
=
0
5x^2 + 2x - 4 = 0
5
x
2
+
2
x
−
4
=
0
Give your solutions correct to 3 significant figures.
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