Упростите выражение(3x-1)*(3x+1)+(3x+1)^2

Question

Упростите выражение

(3x-1)*(3x+1)+(3x+1)^2

Answer 1

(3×-1)*(3×+1)+9×^2+6×+1= 9×^2-1+9×^2+6×+1=6×

Answer 2

(3x-1)*(3x+1)+(3x+1)^2 = (9x^2 - 1) + 9x^2 + 6x + 1 = 18x^2 + 6x = 6*(3x^2 + x)