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x= -7 + √49+40 /-2
x= -7 + √9 /-2
x= -7+3 /-2
x= -4/-2
*x=2
Ahora
-x^2+7x-10=0
sustituimos x
-(2)^2+7(2)-10=0
-4+14-10=0
14-14=0