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∴
a=1
b=4
c=-21
D= b^2-4ac
D= (4)^2 -4(1)(-21)
D=16 + 84
D=100
※ Hallamos las soluciones :
X1= -2-5
X1= -7
(X+7)
X2= -2+5
X2=3
(X-3)
Respuesta :
(x+7)(x-3)
Espero te sirva !! ^^