Question

como resolver essa questao x²-7+6=0

Answer 1

$x^{2} -7+6=0\\ x^2-1=0\\ x^2=1\\ x=\pm 1$

Answer 2

x²-7+6=0
x²-1=0
x²=1
x=+-√1
x = +- 1
S = {+1,-1}