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verificando:
con x=-5
-x²-2x+15=0
-(-5)²-2(-5)+15=0
-25+10+15=0
0=0 verificado
con x=3
-x²-2x+15=0
-(3)²-2(3)+15=0
-9-6+15=0
0=0 verificado
espero te sirva...