Bonjour,
(5x-2)²+(x-7)(5x-2)
= 25x² -20x +4 + 5x² -2x -35x +14
= 30x² -57x +18
Bjr
= (5x-2)²+(x-7)(5x-2)
= 25x²-20x+4+(x-7)(5x-2)
= 25x²-20x+4+5x²-2x-35x+14
= 30x²-20x+4-2x-35x+14
= 30x²-57x+4+14
= 30x²-57x+18
Voilà !
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Bonjour,
(5x-2)²+(x-7)(5x-2)
= 25x² -20x +4 + 5x² -2x -35x +14
= 30x² -57x +18
Bjr
= (5x-2)²+(x-7)(5x-2)
= 25x²-20x+4+(x-7)(5x-2)
= 25x²-20x+4+5x²-2x-35x+14
= 30x²-20x+4-2x-35x+14
= 30x²-57x+4+14
= 30x²-57x+18
Voilà !