23.) ax²-a
a(x²-1)
a(x+1)(x-1)
24.) 2x²-5x+3
2x²-3x-2x+3
(2x²-3x)+(-2x+3)
x(2x-3)-(2x-3)
(2x-3)(x-1)
25.) xy²+8xy+15x
x(y²+8y+15)
x(y²+3y+5y+15)
x((y²+3y)+(5y+15))
x(y(y+3)+5(y+3))
x(y+3)(y+5)
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