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b)(3xy+1)²= 9x²y²+6xy+1
c)(2x-3)²= 4x²-12x+9
d)(4-2m)²= 16-16m+4m²
e)(ax-5a)²= a²x²-10a²x+25a²
f)(3a-3ab)²= 3a²-18a²b+9a²b²
g)(2-√3 x)²= 4-4√3x+3x²
j)(-2+abc)²= 4-4abc+a²b²c²
k)(-3-y)²= (-1*(3+y))²=(3+y)²=9+6y+y²
l)(x-1)(x+1)= x²-1
m)(1+3ab)(1-3ab)= 1-9a²b²
n)(1-√2)(1+√2)= 1-2=-1
o)(xy-mn)(xy+mn)= x²y²-m²n²