Svpp c’est l’exercice 3

A=7-2X(5X-3)

=7-(2X×5X)+(2X×3)

=7-10X^2+6X

B)(2X-3)(5X-4)

=(2X×5X)-(2X×4)-(3×5X)+(3×4)

=10X^2-8X-15X+12

=10X^2-23X+12

C)(X+1/2)^2

=(X×X)+(X×1/2)+(1/2×1/2)+(1/2×X)

=X^2+1/2X+1/4+1/2X

=X^2+X+1/4

D)(6+7X)(6-7X)

=(6×6)-(6×7)+(7X×6)-(7X×7X)

=36-42X+42X-49X^2

=36-49X^2

E)(4X-1)^2

=(4X×4X)+(1×1)-(4X×1)-(1×4X)

=16X^2+1-4X-4X

=16X^2+1-8X

Bonne soirée ☺

Bonsoir,

Développer et réduire les expressions:

A(x)= 7-2x*5x-2x(-3)

A(x)= 7- 10x²+6x

A(x)= -10x²+6x+7

B(x)= 2x(5x)-3(5x)+2x(-4)-3(-4)

B(x)= 10x²-15x-8x+12

B(x)= 10x²-23x+12

C(x)= x*x+x(1/2)+x(1/2)+(1/2)(1/2)

C(x)= x²+x/2+x/2+1/4

C(x)= x²+2x/2+1/4

C(x)= x²+x+1/4

D(x)= 6*6+7x(6)+6(-7x)+7x(-7x)

D(x)= 36+42x-42x-49x²

D(x)= -49x²+36

E(x)= 4x(4x-1(4x-1(4x-1(-1)

E(x)= 16x²-4x-4x+1

E(x)= 16x²-8x+1