Question

RESOLVA AS EQUAÇÕES

A | 2 4 1|
| 2 4 X| = 0
| 3 1 2|

B |2 3 -2|
|0 1 X |= 2
|2 X -3|

C |X+1 3 X|
|3 X 1| =0
|X 2 X-1|

Answer 1

$\left[\begin{array}{ccc}2&4&1\\2&4&x\\3&1&2\end{array}\right \left\begin{array}{ccc}2&4\\2&4\\3&1\end{array}\right] = 0$; 16 + 12x + 2 - 12-2x -16=0; 10x= 10; [/tex]; x = 10; $\left[\begin{array}{ccc}2&3&-2\\0&1&x\\2&x&-3\end{array}\right \left\begin{array}{ccc}2&3\\0&1\\2&x\end{array}\right] = 2; -6 + 6x +4 - 2 x^{2} -2=0;-2 x^{2} + 6x - 4 = 0 (: -2)$; $x^{2} - 3x + 2 =0; x'=1; x"=2;$; $\left[\begin{array}{ccc} x+1&3&x\\3&x&1\\x&2&x-1\end{array}\right \left\begin{array}{ccc}x + 1&3\\3&x\\x&2\end{array}\right] = 0; x ( x^{2} -1) +3x + 6x - x^{3}-2x - 2 - 9x + 9$; $x^{3} - x - x^{3} -2x + 7 = 0;-3x = -7 .(-1)--\ \textgreater \ x = \frac{7}{3}$

Answer 2

OI, tu conseguiu responder a letra A? se sim, anexa aqui pfvr