What is the sum of the coefficients of the polynomial obtained from the square expansion of (1 + 2x-x's Square)

What is the sum of the coefficients of the polynomial obtained from the square expansion of (1 + 2x-x's Square)

Let (1 + 2x-x ^ 2) ^ 2 = A0 + A1 * x + A2 * x ^ 2 + a3 * x ^ 3 + A4 * x ^ 4 (x ^ n represents the nth power of x)
Let x = 1,
Left = 4, right = A0 + A1 + A2 + a3 + A4 = sum of coefficients
So the coefficient sum is 4

Elden Ring Premiere

RELATED INFORMATIONS