Respuesta :

ghanami

Answer:

x=4 positive solution

Step-by-step explanation:

hello :

-x²-x+20 = 0

-(x²+x-20) = 0

means : x²+x-20=0

(x+5)(x-4) =0

x+5 =0 or x-4 =0

x = - 5 refused  x=4 positive solution

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