Bonjour,
[tex]A=(x+7)(3-2x)+(5x-2)(4x+1)\\A=3x-2x^2+21-14x+20x^2+5x-8x-2\\A=18x^2-14x+19[/tex]
[tex]B=(5x-2)(5x-8)-(3x-5)(x+7)\\B=25x^2-40x-10x+16-(3x^2+21x-5x-35)\\B=25x^2-50x+16-3x^2-21x+5x+35\\B=22x^2-66x+51[/tex]
[tex]C=(2x+3)(5x-8)-(2x-4)(5x-1)\\C=10x^2-16x+15x-24-(10x^2-2x-20x+4)\\C=10x^2-x-24-10x^2+2x+20x-4\\C=21x-28[/tex]
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Bonjour,
[tex]A=(x+7)(3-2x)+(5x-2)(4x+1)\\A=3x-2x^2+21-14x+20x^2+5x-8x-2\\A=18x^2-14x+19[/tex]
[tex]B=(5x-2)(5x-8)-(3x-5)(x+7)\\B=25x^2-40x-10x+16-(3x^2+21x-5x-35)\\B=25x^2-50x+16-3x^2-21x+5x+35\\B=22x^2-66x+51[/tex]
[tex]C=(2x+3)(5x-8)-(2x-4)(5x-1)\\C=10x^2-16x+15x-24-(10x^2-2x-20x+4)\\C=10x^2-x-24-10x^2+2x+20x-4\\C=21x-28[/tex]