Question

aaaajudem!

a) x²-2x=9

Answer 1

Ola Leyl

x² - 2x - 9 = 0

delta
d² = 4 + 36 = 40
d = 2√10

x1 = (2 + 2√10)/2 = 1 + √10
x2 = (2 - 2√10)/2 = 1 - √10

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