Question

URGENTE!
Simplifique as expressoes
(x+1)² + (x+2)²

5x-(2x+3)²

(x+5)² - x(x-3)

(2x+1)² + (3x+1)²

Answer 1

(x+1)² + (x+2)² =
x² + 2x.1 + 1 + x² + 2x2 + 4 =
x² +  2x   + 1 + x²  + 4x  + 4 =
2x² + 2x + 4x + 1 + 4 = 2x² + 6x + 5

5x - (2x+3)² =
5x - (4x² + 2.2x.3 + 9) =
5x -  4x²  -    12x   - 9 = -4x² - 7x - 9

(x+5)² - x(x-3) =
x² + 2.x.5 + 25 - x² + 3x =
x² - x² + 10x + 3x + 25 = 13x + 25

(2x+1)² + (3x+1)² =
4x² + 2.2x.1 + 1 + 9x² + 2.3x.1 +1 =
4x² + 9x² + 4x + 6x + 1 +1 = 13x² + 10x + 2