Question

S Efectuați calculele și scrieți rezultatul în forma
cea mai simplă:
a) x(-2x + 1) + 3x(x-2);
b) (2x + 3)(x - 1) + (3x - 2)(x + 5);
c) (-5x + 2)(3x - 1) + (15x + 7)(x-3);
d) (x - 1)(-5x + 3) + 5x(x - 1);
e) (x + 2)(x2 - 2x + 4) - x3 + 8;
f) (2x - 1)(4x2 + 2x + 1) + 1 - 8x3.​

Answer 1

a) Xx(-2x+1)+3Xx(X-2)

Xx(-2X+1+3(x-2))

Xx(-2X+1+3X-6)

Xx(X-5)

b)(2X+3)x(X-1)+(3X-2)x(X+5)

2X\2-2X+3X-3+3X\2+15X-2X-10

5X\2+14X-13

c)(-5X)x(3X-1)+(15X+7)x(X-3)

-15X\2+5X+6X-2+15X\2-45X+7X-21

-27X-23

d)(X-1)x(-5X+3)+5Xx(X-1)

(X-1)x(-5X+3+5X)

(X-1)x3

3(X-1)

f)(2X+1)x(2X+2X+1)+1-8Xx3

(2X+1)x(4X+1)+1-24X

8X\2+2X+4X+1+1-24X

8X\2-18X+2