Question

1. a) 2x + 10x² - 72=0
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Answer 1

Vamos là.

10x² + 2x - 72 = 0

5x² + x - 36 = 0

delta

d² = 1 + 4*5*36 = 721

x1 = (-1 + √721)/10

x2 = (-1 - √721)/10