Question

determine todas as suas possiveis raizes de cada equaçao: (obs:o X e de multiplicaçao e o x de letra) A)7 X x=0 B)x X (x -1)=0 C)(x+2)X(x+3)=0 D)(x-8)sobre 2=0 E)(9-x) X x X (x+5)=0 F)(2x-1)X(3x+2)=0

Answer 1

Explicação passo-a-passo:

a) $\sf 7\cdot x=0$

$\sf x=\dfrac{0}{7}$

$\sf x=0$

$\sf S=\{0\}$

b) $\sf x\cdot(x-1)=0$

$\sf x'=0$

$\sf x-1=0~\rightarrow~x"=1$

$\sf S=\{0,1\}$

c) $\sf (x+2)\cdot(x+3)=0$

$\sf x+2=0~\rightarrow~x'=-2$

$\sf x+3=0~\rightarrow~x'=-3$

$\sf S=\{-3,-2\}$

d) $\sf \dfrac{x-8}{2}=0$

$\sf x-8=0$

$\sf x=8$

$\sf S=\{8\}$

e) $\sf (9-x)\cdot x\cdot(x+5)=0$

$\sf 9-x=0~\rightarrow~x'=9$

$\sf x"=0$

$\sf x+5=0~\rightarrow~x'"=-5$

$\sf S=\{-5,0,9\}$

f) $\sf (2x-1)\cdot(3x+2)=0$

$\sf 2x-1=0~\rightarrow~2x=1~\rightarrow~x'=\dfrac{1}{2}$

$\sf 3x+2=0~\rightarrow~3x=-2~\rightarrow~x'=\dfrac{-2}{3}$

$\sf S=\left\{\dfrac{-2}{3},\dfrac{1}{2}\right\}$