Question

ajutor va rog frumos ​

Answer 1

Explicație pas cu pas:

a)

2(3x²-2x-5) - 3(4x²-2x-7) - 4(2x²+x+3) = 6x²-4x-10 - 12x²+6x+21 - 8x²-4x-12 = (6x²-20x²) + (6x-8x) + (21-22) = - 14x² - 2x - 1

b)

3(2x²-x+4) - 4(3x²-2x+5) - 2(x²+7x-3) = 6x²-3x+12 - 12x²+8x-20 - 2x²-14x+6 = (6x²-14x²) + (8x-17x) + (18-20) = - 8x² - 9x - 2

c)

2(6x²-5x+4) - 3(4x²-3x+5) - 4(2x²+3x-4) = 12x²-10x+8 - 12x²+9x-15 - 8x²-12x+16 = (12x²-20x²) + (9x-22x) + (24-15) = - 8x² - 13x + 9