Sagot :
<2>=au carré
A=(2x+5)x(2x+5)
A=2xX2x+2xX5+5X2x+5x5
A=4x<2>+15x+15x+25
A=4x<2>+30x+25
B=(3-2x)x(3-2x)
B=3X3+3X-2x-2xX3-2xX-2x
B=9-6x-6x+4<2>2
B=9-12x+4x<2>
C=(2x+4)x(2x-4)
C=2xX2x+2xX-4+4X2x+4X-4
C=4x<2>2-8x+8x-16
C=4x<2>-16
D=-(x+4)x-(x+4)
D=-xX-x-xX-4-4X-x-4X-4
D=x<2>+4x+4x+16
D=x<2>+8x+16
E=9x-(7x+3)x-(7x+3)
E=9x[-7xX-7x-7xX3+3X-7x+3X3]
E=9x+49x<2>-21x-21x+9
E=49x<2>-33+9
A= (2x + 5) ²
(2x+5)(2x+5)
2x x 2x + 2x x 5 + 5 x 2x + 5 x 5
4x² + 10x + 10x + 25
4x² + 20x + 25
B= (3 - 2x) ²
(3 - 2x)(3 - 2x)
3 x 3 + 3 x (-2x) + (-2x) x 3 + (-2x) x (-2x)
36 + (-6x) + (-6x) + 4x²
4x² - 12x + 36
C= (2x + 4)(2x - 4)
2x x 2x + 2x x (-4) + 4 x 2x + 4 x (-4)
4x² + (-8x) + 8x + (-16)
4x² + x - 16
D= - (x + 4) ²
(x + 4)(x + 4)
x x x + x x 4 + 4 x x + 4 x 4
x² + 4x + 4x + 16
x² + 8x + 16
(2x+5)(2x+5)
2x x 2x + 2x x 5 + 5 x 2x + 5 x 5
4x² + 10x + 10x + 25
4x² + 20x + 25
B= (3 - 2x) ²
(3 - 2x)(3 - 2x)
3 x 3 + 3 x (-2x) + (-2x) x 3 + (-2x) x (-2x)
36 + (-6x) + (-6x) + 4x²
4x² - 12x + 36
C= (2x + 4)(2x - 4)
2x x 2x + 2x x (-4) + 4 x 2x + 4 x (-4)
4x² + (-8x) + 8x + (-16)
4x² + x - 16
D= - (x + 4) ²
(x + 4)(x + 4)
x x x + x x 4 + 4 x x + 4 x 4
x² + 4x + 4x + 16
x² + 8x + 16