Question

Rezolvati ecuatiile in multimea indicata:
a)5x=7,x apartine multimii Z
b)2x=-3+(-2) la a puterea a doua ,x apartine multimii Q
c)3x+4x=21,x apartine multimii N
d)11y-4y=6-(-15),y apartine multimmi Z
e)x(9+4)=3 la puterea a doua+2 la puterea a doua,x apartine multimii Q
f)x+2x+3x=-42,x apartine multimii N

Answer 1

$a)5x = 7$

$x = \frac{7}{5} \: nu \: apartine \: lui \: z$

$b)2x = - 3 + {( - 2)}^{2}$

$2x = - 3 + 4$

$2x = 1$

$x = \frac{1}{2} \: apartine \: lui \: q$

$c)3x + 4x = 21$

$7x = 21$

$x = \frac{21}{7}$

$x = 3 \: apartine \: lui \: n$

$d)11y - 4y = 6 - ( - 15)$

$7y = 6 + 15$

$7y = 21$

$y = \frac{21}{7}$

$y = 3 \: apartine \: lui \: z$

$e)x(9 + 4) = {3}^{2} + {2}^{2}$

$9x + 4x = 9 + 4$

$13x = 13$

$x = \frac{13}{13}$

$x = 1 \: apartine \: lui \: q$

$f)x + 2x + 3x = - 42$

$6x = - 42$

$x = - \frac{42}{6}$

$x = - 7 \: nu\: apartine \: lui \: n$