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-3-5=-8 y -3*(-5)= 15
la factorización sería (x-3)(x-5)= x^2-8x+15
a=1
b=8
c=15
-8 ⁺₋√8²₋4(1)(15) / 2(1)
x₁=₋8⁺1 =-7
x₂=₋8-1 =-9