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a= 4
a+b+c = 4+2+3 =9
Espero haberte ayudado :)
Se cumple qué :
5x²+2x+3 ≡ (a+1)x²+bx+c
Solo iguala.
5 = a + 1
5 - 1 = a
4 = a
....................................................
2 = b
......................................................
c = 3
.......................................................
Respuesta.
4 + 2 + 3 = 9