Question

as raizes da equacao xao qudrado-7x+6=0,sao

Answer 1

x²-7x+6=0
delta= 7²-4.1.6 --> delta= 25
x=7+-5/2 
x'= 12/6 --> x'=6 
x''=7-5/2 --> x''=1

Answer 2

$x^{2} -7x+6=0\\\\ a=1;b=-7;c=6\\\\\\ \Delta=b^2-4ac\to \Delta=(-7)^2-4*1*6\to \Delta=49-24\to \Delta=25\\\\ x' \neq x''\\ \\ x= \frac{-b\pm \sqrt{\Delta} }{2a} \to x= \frac{-(-7)\pm \sqrt{25} }{2*1} \to x= \frac{7\pm 5 }{2} \to x= \frac{7\pm 5 }{2} \to \\\\\\ x'= \frac{7+5 }{2} \to x'= \frac{12 }{2} \to x'=6\\\\\\ x''= \frac{7- 5 }{2} \to x''= \frac{2 }{2} \to x''=1 \\\\\\\\ S=(1;6)$

Espero ter ajudado...