Question

(2x - 5)² +3(x-2)(x+2) – (x+4)²

Rapid!​

Answer 1

Răspuns:

Explicație pas cu pas:

(2x-5-x-4)(2x-5+x+4)+3 (x²-4)=(x-9)(3x-1)+3(x²-4)=3x²-27x-x+9+3x²-12=6x²-28x-3

Answer 2

Raspuns:

6x^2-28x-3

Explicație pas cu pas:

(2x-5)^2+3(x-2)(x+2)-(x+4)^2=

FOLOSIND FORMULA (a-b)^2=a^2-2ab++b^2,transforma EXPRESIA

4x^2-20x+25+3(x-2)(x+2)-(x+4)^2

INMULTESTE PARANTEZA CU 3

4x^2-20x+25+3x^2-12-(x^2+8x+16)=4x^2-20x+25+3x^2-12-x^2-8x-16

REDU TERMENII ASEMENEA

6x^2-20x+25-12-8x-16=

6x^2-28x-3