Tìm x: (x − 2)(x + 2) − x^2 = 5 + x; 4x^2 − 1/25 + 2x = (x + 1)^2 − (x^2 + 1)

Tìm x:
a, (x−2)(x+2)−x^2=5+x
b,
4x^2−1/25+2x=(x+1)^2−(x^2+1)