Réponses

2014-03-15T20:58:39+01:00

(7X-5)(7X-5)= (7x - 5 ) ² = 7²x² - 2*5*7x + 5²

= 49x² - 70x + 25

2014-03-15T20:59:39+01:00
A=(7X-5)(7X-5)
A=49x
²-35x-35x+25
A=49x²-70x+25