La distancia entre los puntos R y P
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RP=X
H=hipotenusa
A Y B=catetos
triangulo rectangulo OTP
H²=A²+B²
(6.5+x)²=(6.5)²+(20)²
42.25+x²+2(6.5)x=42.25+400
x²+13x=400
x²+13x-400=0
formula general:
-b+-√b²-4ac/2a
a=1
b=13
c=-400
-13-√13²-4(1)(-400)/2(-1)
27.53