Question

determine caso existam os zeros de cada função f(x)=x²-7x+10

Answer 1

$f(x)=x^2-7x+10$

$f(x)=0$

$x^2-7x+10=0$

$\Delta=(-7)^2-4\cdot1\cdot10=49-40=9$

$x=\dfrac{-(-7)\pm\sqrt{9}}{2}=\dfrac{7\pm3}{2}$

$x'=\dfrac{7+3}{2}=5$ e $x"=\dfrac{7-3}{2}=2$

Os zeros são $2$ e $5$.