Algebraic factorization

Question

1) (x+3)^2 - (x+1)^2
2) (x-4)^2-16(x+2)^2
3) 4(x+1)^2 -(2-x)^2

Answer 1

all these can be solved by using the formula
a^2-b^2=(a+b)*(a-b)

(1)---> ans. is (2x+4)*(2)
(2)---> ans. is (5x+4)*(-3x-4)
(3)---> ans. is (3x+6)*(5x-2)