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x²+8x-65=0
Por factorización:
(x+13)(x-5)=0
x+13=0
x₁=-13
x-5=0
x₂=5
Tomamos el valor positivo
Es la respuesta.
x2+x8=80-15
10x=65
x=65/10=6.5
6.5*2+6.5*8+15=80
13+52+15=80