Question

a) (3x + 1)(x2 – 3x + 5) – (x + 2)(2x - 7x + 3) - (x - 1)(x2 + x + 1);
b) (2x - 3)(2x - 4x – 3) – (x – 3)(3x? – 5x – 2) - (x + 2)(x2 – x + 1);
c) (82 - 2x + 1)(x2 + 3x + 3) – (x2 – 2x - 3)(x2 - x + 2) - (x - 2)(x2 – 3x + 3);
d) (x2 + 2x + 5)(x2 – 3x – 4) – (x2 – 2x – 1)(x2 + 3x + 1) – (2x2 + x + 1)(x - x + 1).​

Answer 1

Explicație pas cu pas:

a)(3x+1)(x^2-3x+5)-(x+2)(2x-7x+3)-(x-1)(x^2+x+1)

=(3x×x^2-3x×3x+3x×5+1×x^2-1×3x+1×5)-(x×2x-x×7x+x×3+2×2x-2×7x+2×3)-(x×x^2+x×x+x×1-1×x^2-1×x-1×1)

=(3x^3-9x^2+15x+x^2-3x+5)-(2x^2-7x^2+3x+4x-14x+6)-(x^3+x^2+x-x^2-x-1)

=3x^3-8x^2+12x+5+5x^2+7x-6-x^3+1

=2x^3-3x^2+12x

Acesta este un model.....le vrei si pe celelalte?