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B= x-2
A²+B²=130
Sustituyendo
x²+(x-2²)= 130
x²+ x²- 4x+4= 130
2x²- 4x= 130
2x²- 4x= 130-4
2x²-4x= 126
2x²-4x-126=0
simplificando
x²- 2x - 63= 0
(x+7) (x-9)
x= -7
x= 9
se toma el positivo porque es edad
A= 9
B= x-2
B= 9-2= 7
R.
A= 9 años
B= 7 años
A = x A²+B²=130
B = x-2
Ahora
A²+B²=130
x²+(x-2)²= 130
x²+ x²- 4x+4= 130
2x²- 4x= 130
2x²- 4x -126 = 0 entre 2
x²- 2x - 63= 0
x +7
x -9
-9x + 7x = -2x
(x+7) (x-9) = 0
x+7 = 0 x-9 = 0
x = -7 x = 9
tomamos
x = 9
se toma el positivo porque no hay edades negativas
A = 9
B = x-2
B = 9-2= 7
axllxa