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8. Scoateţi factorul comun:
a) 3(2 + 5x)²-x(2 + 5x) + 5(2 + 5x);
b) (x−y)(2x - y) + (x-y)²-3y(x - y);
c) (x+3)(2x-y)-(2x-y)(x + 1) + 5x(2x - y);
d) (3a-5)²-2(5-3a) + (a - 5)(3a-5);
e) (5-2x)(7x-2) + 7x(2-7x) + (7x - 2)²;
f) (v-6)³ + (v + 1)(y-6)²-(5-3y)(y-6)²
Repedeee va roog​


Răspuns :

8. Scoateți factorul comun:

a) 3(2+5x²) - x(2+5x) + 5(2+5x) =

= (2+5x) × [3(2+5x)-x+5] =

= (2+5x)(11+14x)

b) (x-y)(2x-y) + (x-y)² - 3y(x-y) =

= (x-y)(2x-y+x-y-3y) =

= (x-y)(3x-5y)

c) (x+3)(2x-y) - (2x-y)(x+1) + 5x(2x-y) =

= (2x-y) × [x+3-(x+1)+5x] =

= (2x-y)(2+5x)

d) (3a-5)² - 2(5-3a) + (a-5)(3a-5) =

= (3a-5)² + 2(3a-5) + (a-5)(3a-5) =

= (3a-5)(3a-5+2+a-5) =

= (3a-5)(4a-8)

e) (5-2x)(7x-2) + 7x(2-7x) + (7x-2)² =

= (7x-2)(5-2x-7x+7x-2) =

= (7x-2)(3-2x)