Question

Resolva as seguintes equações do 2o grau incompletas:

Answer 1

Resposta:

Explicação passo a passo:

$h)$

$x^{2} -7x=0$

$x.(x-7)=0$

$x=0$

$ou...$

$x-7=0$

$x=7$

$S=\{0;7\}$

$i)$

$x^{2} +5x=0$

$x.(x+5)=0$

$x=0$

$ou...$

$x+5=0$

$x=-5$

$S=\{0;-5\}$

$j)$

$4x^{2} -9x=0$

$x.(4x-9)=0$

$x=0$

$ou...$

$4x-9=0$

$4x=9$

$x=\frac{9}{4}$

$S=\{0;\frac{9}{4} \}$

$k)$

$3x^{2} +5x=0$

$x.(3x+5)=0$

$x=0$

$ou...$

$3x+5=0$

$3x=-5$

$x=-\frac{5}{3}$

$S=\{0;-\frac{5}{3} \}$

$l)$

$4x^{2} -12x=0$

$x.(4x-12)=0$

$x=0$

$ou...$

$4x-12=0$

$4x=12$

 $x=12/4$

 $x=3$

$S=\{0;3\}$

$m)$

$5x^{2} +x=0$

$x.(5x+1)=0$

$x=0$

$ou...$

$5x+1=0$

$5x=-1$

$x=-\frac{1}{5}$

$S=\{0;-\frac{1}{5} \}$

$n)$

$x^{2} +x=0$

$x.(x+1)=0$

$x=0$

$ou...$

$x+1=0$

$x=-1$

$S=\{0;-1\}$

$Prontinho!$