Bonsoir,
[tex]D=(7x-2)^2\\D=(7x)^2-2*7x*2+2^2\\D=49x^2-28x+4[/tex]
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Bonsoir,
[tex]D=(7x-2)^2\\D=(7x)^2-2*7x*2+2^2\\D=49x^2-28x+4[/tex]