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a)-4x²-20x=-4x(x+5)
b)-4x²-20x=-20(1/5x²+x)
c)-4x²-20x=-20x(1/5x+1)
2.
a)8a²+5a=8(a²+0,625)
b)5a²+10a=5(a+2)
c)3a-9=-3(-a+3)
d)3a-6b=3(a+2b)