Question

Determine o valor de x de cada item. ​

Answer 1

$a)\ x^2=121\\x=\pm11\\\\S=\{-11,\ 11\}\\b)\ 3x^2=243\\x^2=81\\x=\pm9\\\\S=\{-9,\ 9\}\\\\c)\ 2x^2=6x\\2x^2-6x=0\\2x(x-3)=0\\\\2x_1=0\\x_1=0\\\\x_2-3=0\\x_2=3\\\\S=\{0,\ 3\}\\\\d)\ \dfrac{x^2}{3}-2x=0\\\\x\left(\dfrac{x}{3}-2\right)=0\\\\x_1=0\\\\\dfrac{x_2}{3}-2=0\\\\\dfrac{x_2}{3}=2\\\\x_2=6\\\\S=\{0,\ 6\}$

Espero ter ajudado. ;)