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Sagot :

AYUDA

bjr

7x² + 27 - 90 = 0

7x² - 63 = 0

7 (x² - 9) = 0

(x - 3) (x + 3) = 0

soit x = 3 soit x = -3

8x² - 128 = 0

8 (x² - 16) = 0

(x + 4) (x - 4) = 0

soit x = -4 soit x = 4

9x² + 500 - 2021 = 0

9x² - 1521 = 0

9 (x² - 169) = 0

tu finis

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