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(y₂-y₁)² + (x₂-x₁)² = D²
P₁(x₁ , y₁) → P( x , 7 )
P₂(x₂ , y₂) → P( 0 , 4 )
D → Distancia = 5
Reemplazando:
( 4 - 7 )² + ( 0 - x )² = 5²
( -3 )² + x² = 25
9 + x² = 25
x² = 25 - 9
x= √16
x= 4 → Solcuion : P( 4 , 7 )
b)
P₁( x , x )
P₂( 2 , 0 )
D → Distancia = 2
Reemplazando:
( 0 - x )² + ( 2 - x )² = 2²
x² + 4 - 4x + x² = 4
2x² -4x = 4 - 4
2x² - 4x = 0 → Solucion : Por discriminante "x₂=0 , x₁=2"
Puedes elegir si "x" tendra el valor de "0" o "2"