Bonjour,
[tex]C=(2x+6)^2-(2x+6)(5x-7)\\C=(2x)^2+2*2x*6+6^2-(10x^2-14x+30x-42)\\C=4x^2+24x+36-10x^2+14x-30x+42\\C=-6x^2+8x+78[/tex]
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Bonjour,
[tex]C=(2x+6)^2-(2x+6)(5x-7)\\C=(2x)^2+2*2x*6+6^2-(10x^2-14x+30x-42)\\C=4x^2+24x+36-10x^2+14x-30x+42\\C=-6x^2+8x+78[/tex]