Sagot :
1) (3x-9)(2x+6) = 6x² + 18x -18x - 54
= 6x² -54
2) 4x-2x²-32+14x - 5x² + 40x + 7x - 56 = -7x² + 65x - 88
3) 4(10x²-6x+15x-9)= 4(10x² +9x -9) = 40x² + 36x - 36
Voilààà :)) ♥
= 6x² -54
2) 4x-2x²-32+14x - 5x² + 40x + 7x - 56 = -7x² + 65x - 88
3) 4(10x²-6x+15x-9)= 4(10x² +9x -9) = 40x² + 36x - 36
Voilààà :)) ♥
(3x-9)(2x+6)
=6x²+18x-18x-54
=6x²-54
(x-7)(4-2x)-(5 x+7)(x-8)
=4x-2x²-28+14x-(5x²-40x+7x-56)
=4x-2x²-28+14x-5x²+40x-7x+56
=-7x²+51x+28
(x+1)(-1)-(4x² +5x-7)
=-x-1-4x²-5x+7
=-4x²-6x+6
4(2x+3)(5x-3)
=4(10x²-6x+15x-9)
=40x²-24x+60x-36
=40x²+36x-36
=6x²+18x-18x-54
=6x²-54
(x-7)(4-2x)-(5 x+7)(x-8)
=4x-2x²-28+14x-(5x²-40x+7x-56)
=4x-2x²-28+14x-5x²+40x-7x+56
=-7x²+51x+28
(x+1)(-1)-(4x² +5x-7)
=-x-1-4x²-5x+7
=-4x²-6x+6
4(2x+3)(5x-3)
=4(10x²-6x+15x-9)
=40x²-24x+60x-36
=40x²+36x-36