Question

raiz quadrada
x-1=x-7
equaçao irracional

Answer 1

$\sqrt{x-1}=x-7 \\ \\ ( \sqrt{x-1})^2=(x-7)^2\\ \\ x-1=x^2-14x+49\\ \\ x^2-15x+50=0\\ \\ \Delta=(-15)^2-4.1.50=225-200=25\\ \\ x=\frac{15 \pm5}{2}\\ \\ x_1=5\\ \\ x_2=10$