Question

What is the expression of the the value of the expression when n=3? -2n(5+n-8-3n

Answer 1

-2n(5 + n - 8 - 3n) = -2n(-3 - 2n) = 6n + 4n²

n = 3, subtitute

6 · 3 + 4 · 3² = 18 + 4 · 9 = 18 + 36 = 54

Answer 2

-2×3 (5+3 - 8 - 3×3)
   ↓      ↓              ↓
 -6      ( 8 - 8 -  9)
               ↓
               0  
     -6 (-9)
          ↓
         54: answer