Question

(x-2)^2-(x-1)^2+(x-2)(x+2)+3x​

Answer 1

Se folosesc formulele de calcul prescurtat.

(x-2)²-(x-1)²+(x-2)(x+2)+3x =

= x²-4x+4 - (x²-2x+1) + x²-4 + 3x =

= x²-4x+4-x²+2x-1+x²-4+3x =

= x²+x-1