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45= (x+8)(x)/2
90=x(x+8)
90=x²+8x
x²+8x-90=0 aplicandoformula cuadratica general
-8+₋√8²-4(1)(-90)/2(1)= -8+₋√424/2=√2² *2 *53/2=-8+₋2√106/2