9x²-16y²=(3x)²-(4y)²
=(3x+4y)(3x-4y)
100-(3x+2y)²
=10²-(3x+2y)²
=(10+3x+2y)(10-3x-2y)
a²b³-4a²b=a²b(b²-4)
=a²b(b²-2²)
=a²b(b+2)(b-2)
(2x+1)²-x²=(2x+1+x)(2x+1-x)
=(3x+1)(x+1)
9x²-16y²=(3x)²-(4y)²
=(3x+4y)(3x-4y)
100-(3x+2y)²
=10²-(3x+2y)²
=(10+3x+2y)(10-3x-2y)
a²b³-4a²b=a²b(b²-4)
=a²b(b²-2²)
=a²b(b+2)(b-2)
(2x+1)²-x²=(2x+1+x)(2x+1-x)
=(3x+1)(x+1)