Question

Simplifique as expressões.

A) y x (y + 2) - 2y x (3 - y)
B) (2 - x)² - (x + 2)²
C) (a +5) x (a - 5) - (a +5)

Answer 1

A) y*(y+2)-2y*(3-y)
   y²+2y-6y-2y²
    -y²-4y
B(2-x)²-(x+2)²
  x²-2x-2x+4-x²+2x+2x+4
  x²-4x+4-x²+4x+4
  x²-x²-4x+4x+4+4
          8

C)(a+5)*(a-5)-(a+5)
    a²-5a+5a-25-a-5
    a²-a-30