Watch the video here on how to solve quadratic equations using Quadratic formula method:

After watching the video, try and solve the following quadratic equations using Quadratic formula method:

(1) x^{2} + 5 + 6x = 0 (2) x^{2} – 2x – 3 = 0 (3) 2x^{2} – 5x – 3 = 0 (4) 2x^{2} – 3x – 20 = 0

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