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Sagot :

[tex](x+15)(x+15) = (x + 15 + 15)x[/tex]

[tex] {(x+15)}^{2} = {x}^{2} +15x+15x[/tex]

[tex] {x}^{2} + 30x + 225 = {x}^{2} + 30x[/tex]

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