Question

Escreva a equação de grau cujo as raízes São 1 e 2

Answer 1

$(x- x_{1} ).(x- x_{2} )$
$(x-1).(x-2)$
$x^{2} -3x+2$

$x^{2} -3x+2=0$
Δ=$b^{2} -4.a.c$
Δ$=( -3)^{2} -4.1.2$
Δ$=9-8$
Δ$=1$

$x= \frac{-(b)+/- \sqrt{1} }{2.a}$
$x_{1} = \frac{3+1}{2}$ ⇒ $\frac{4}{2}$⇒$2$

$x_{2} = \frac{3-1}{2}$ ⇒ $\frac{2}{2}$ ⇒$1$