Question

3) CALCULE
SEGUNDO TEOREMA DE TALES
AJUDA AQUI PELO AMOR DE DEEEEUUUUUSSSSS

Answer 1

Resposta:

Explicação passo a passo:

$\frac{x}{2}=\frac{4}{x+2}$

$x.(x+2)=4\:.\:2$

$x^{2} +2x=8$

$x^{2} +2x-8=0$

$x^{2} +2x+1-8=0+1$

$(x+1)^{2} -8=1$

$(x+1)^{2} =9$

$x+1=\sqrt{9}$

$x+1=3$

$x=2$

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 $\frac{2}{x}=\frac{3}{9}$

$3x=18$

  $x=18/3$

  $x=6$

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$\frac{x}{20}=\frac{21}{28}$

$28x=420$

  $x=420/28$

  $x=15$