Question

(5x+3)²-(x+2)²
4(5x+3)²-25(x+2)²

Answer 1

Răspuns:

(5x+3)²-(x+2)²=

25x²+30x+9-(x²+4x+4)=

25x²+30x+9-x²-4x-4=24x²+26x+5

4(5x+3)²-25(x+2)²=

4(25x²+30x+9)-25(x²+4x+4)=

100x²+120x+36-25x²-100x-100=75x²+20x-64

Reține:

(a+b)²=(a)²+2×(a)×(b)+(b)²

(a+b)(a-b)= (a)²-(b)²

(a+b+c)²=(a)²+(b)²+(c)²+2×(a)×(b)+2×(a)×(c)+2×(b)×(c)

(a+b)³=(a)³+(b)³+3×(a)²×(b)+3×(a)×(b)²

+ • + = +

- • - = +

- • + = -

sper că te-am ajutat