Sagot :
A = (x-1)+(2x-3)(x+5)
=x-1+2x²+10x-3x-15
=2x²+8x-16
B = (x+3)(x-4)-3(x-2)
= x²-4x+3x-12-3x+6
= x²-4x-6
=x-1+2x²+10x-3x-15
=2x²+8x-16
B = (x+3)(x-4)-3(x-2)
= x²-4x+3x-12-3x+6
= x²-4x-6
A = ( x - 1 ) + ( 2x - 3 ) ( x + 5 )
= x - 1 + 2x * x + 2x * 5 - 3 * x - 3 * 5
= x - 1 + 2x^2 + 10x - 3x - 15
= 2x^2 - 16 + 8x
B = ( x + 3 ) ( x - 4 ) - 3 ( x - 2 )
= x * x + x * (-4) + 3 * x + 3 * (-4) - 3 * x - 3 * (-2)
= x^2 - 4x + 3x - 12 - 3x + 6
= x^2 - 4x - 6
= x - 1 + 2x * x + 2x * 5 - 3 * x - 3 * 5
= x - 1 + 2x^2 + 10x - 3x - 15
= 2x^2 - 16 + 8x
B = ( x + 3 ) ( x - 4 ) - 3 ( x - 2 )
= x * x + x * (-4) + 3 * x + 3 * (-4) - 3 * x - 3 * (-2)
= x^2 - 4x + 3x - 12 - 3x + 6
= x^2 - 4x - 6