Justifier que 2(x-7)[tex]^2[/tex]+62=2x[tex]^2[/tex]-28x+160

Merci d'avance ! !

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Grade: Education Subject: mathematiques
Justifier que 2(x-7)[tex]^2[/tex]+62=2x[tex]^2[/tex]-28x+160

Merci d'avance ! !
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2(x-7)+62=2x-28x+160
2(x² -14x +49) +62 = 2x² -28x +160
2x² - 28x + 98 +62 = 2x² -28x +160
2x² -28x + 160 = 2x² -28x +160