Question

resolva as inequações abaixo
a)2x +7 >3x -15
b)
$2x \geqslant 5x + 8$


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Answer 1

Resposta:

Explicação passo a passo:

$a)$

$2x+7>3x-15$

$2x-3x>-15-7$

   $-x>-22\:\:.(-1)$

      $x<22$

$b)$

  $2x\geq 5x+8$

  $2x-5x\geq 8$

      $-3x\geq 8\:\:.(-1)$

         $3x\leq -8$

           $x\leq -\frac{8}{3}$

Answer 2

Resposta:a)

a) S = { x ∈ R/x < 22}

b) S = {x ∈ R/x ≤ -8/3}

Explicação passo a passo:

$a)2x+8>3x-15\\\\2x-3x>-15-7\\\\-x>-22\\\\-x(-1)>-22\\\\x <22$

$2x\geq5x+8\\\\2x-5x\geq 8\\\\-3x\geq 8\\\\-3x(-1)\geq 8(-1)\\\\3x \leq -8\\\\x\leq -\frac{8}{3}$