a²-b² = (a+b)×(a-b)

c²-9 = c²-3² = (c+3)(c-3)

a²-4= a²-2² = (a+2)(a-2)

x²-16 = x²-4²= (x+4)(x-4)

d²-49 = d²-7²= (d+7)(d-7)

64-m²= 8²-m²= (8-m)(8+m)

36-p²= 6²-p²= (6-p)(6+p)

0,81-b² = 0.9²-b²= (0.9-b)(0.9+b)

0,25-q²= 0.5²-q²= (0.5-q)(0.5+q)

0,01-a²= 0,1²-a²= (0,1-a)(0,1+a)

y²-0,09= y²-0,3² = (y-0,3)(y+0,3)

k²-0,04= k²-0,2²= (k-0.2)(k+0.2)

x²-1,44= x²-1.2²= (x-1.2)(x+1.2)