Question

3- A distancia do ponto A(a,1) ao ponto B(0,2) igual a 3. calcule o valor da obscissa

Answer 1

$d^{2} = (Xb-Xa)^{2} + (Yb-Ya)^{2} } 3^{2} = (Xb-Xa)^{2} + (Yb-Ya)^{2} } 9 = (0-a)^{2} + (2-1)^{2} } 9 = a^{2} + 1^{2} } 9 = a^{2} + 1 } 9 - 1 = a^{2}} a^{2}} = 8 a = \sqrt{8} a = \sqrt{2.4} a = 2\sqrt{2}$