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bonsoir

D =  x ( x + 3 ) + 8 =  x² - 3 x + 14

⇔  x² + 3 x + 8 = x² - 3 x + 14

⇔ x² - x² + 3 x + 3 x = 14 - 8

⇔  6 x =  6

⇔ x = 1

Bonsoir

[tex]x(x + 3) + 8 = x {}^{2} - 3x + 14 \\ x {}^{2} + 3x + 8 = x {}^{2} - 3x + 14 \\ 3x + 3x = 14 - 8 \\ 6x = 6 \\ x = \frac{6}{6} = 1[/tex]

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