Question

x2-49=0
equaçao de segundo grau,

Answer 1

$x^{2} -49=0 x^{2} =49 x=-+ \sqrt{49} x=-+7 x=-7x=+7$

S={7,-7}

Answer 2

  x2 - 49 = 0   eq.incompleta

    x2 = 49
  
   x = +/- 7