bonsoir j ai besoin d aide poir demain. Developpé puis reduire : A=(x-5)²+(4x-1)(2x-10) mercie beaucoup ​

bjr

A = (x - 5)²+(4x - 1)(2x - 10)  

  = x² - 10x + 25 + 8x² -40x - 2x + 10

= x² + 8x² -10x -40x - 2x + 25 + 10  

= 9x² - 52x + 35

A=(x-5)²+(4x-1)(2x-10)

=(X×X)-(X×5)+(5×5)-(5×X)+(4X-1)(2X-10)

=X^2-5X+25-5X+(4X-1)(2X-10)

=X^2-10X+25+(4X-1)(2X-10)

=X^2-10X+25+(4X×2X)-(4X×10)-(1×2X)+(1×10)

=X^2-10X+25+8X^2-40X-2X+10

=9X^2-10X+25-40X-2X+10

=9X^2-50X+25-2X+10

=9X^2-52X+25+10

=9X^2-52X+35