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Descompusa in factori expresia 5x la puterea a doua + 15x -20 este...va rog sa ma ajutati

Răspuns :

5x²+15x-20=5(x²+3x-4)=5(x²-4x+x-4)=5[x(x-4)+(x-4)]=5(x-4)(x+1)
5x la 2 +15x-20=(5x-5)(x+4)
(5x-5)(x+4)=5x la 2+20x-5x-20=5x la 2+15x-20