1. Solve these quadratic equations using the quadratic formula.

Where necessary, give your answers to 3 significant figures.

(a) 3x2 + 10x + 6 = 0 (b) 5x2 - 6x + 1 = 0

(c) 2x2 - 7x - 15 = 0 (d) x2 + 4x + 1 = 0

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