Respuesta :

wolf1728

Answer:

a = -1  b = -9   c = -20

x1 = [--9 +- (sq root -9^2 - 4 * -1 * -20)] / 2 * -1

x1 = 9 +sq root (81 - 80) / -2

x1 = [9 + 1 ] / -2

x1 = -5

x2 = 9 -sq root (81 - 80) / -2

x2 = 8 / -2

x2 = -4

Step-by-step explanation:

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