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Sagot :
Answer: Pedro tiene 21 años.
Step-by-step explanation:
Sea x su edad actual.
Dentro de 11 años tendrá (x+11) años.
Hace 13 años fue (x-13)
Por lo tanto (x+11) = ((x-13)(x-13))/2
Multiplica ambos por 2 y Foil.
2x+22 = x*x - 26x + 169 (Lo siento, x*x es x al cuadrado - limitaciones del teclado)
Recoger términos semejantes:
x*x - 28x +147 = 0
Entonces la factorización da:
(x-21)(x-7)=0
Por propiedad del producto cero:
X-21 = 0. X = 21
X-7 = 0. X = 7
Ahora prueba para x = 21.
(21+11) = ((21–13)(21–13))/2
32 = 64/2
entonces tu edad es 21
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