Respuesta :

5b out of -5a^2b+10a^2=20b+25a^3b. 
Put 5b on the outside of the whole equation and divide each number by 5
-5a^2 turns into -a^2+
10ab^2 turns into 2ab(no square)
20b turns into 4b
25a^3b turns into 5a^3
so your equation would be 5b(-a^2+2ab-4+5a^2)

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