Răspuns:
A.a. (x+1+3)(x+1-3)
b.(x+2+5)(x+2-5)
d. (x-5+6)(x-5-6)
e.(y-2+8)(y-2-8)
g. (2x+1+1)(2x+1-1)
h. (3x-4+1)(3x-4-1)
j. (4x+1+6)(4x+1-6)
k. (5+2x+3)(5-2x-3)
B.a. (2a+2+3)(2a+2-3)
b. (10x+5+4)(10x+5-4)
d. (3x+3x-2)(3x-3x+2)
e.(4x+8+5)(4x+8-5)
g.(5x+2x+1)(5x-2x-1)
h. (15x+5+2x)(15x-5-2x)