212 / बीजगणित (Algebra) 24. यदि \( 4,2 x-4, \ldots \ldots, 64,21 x+2 \) एउटा गुणोत्तर अनुक्रमको पदहरू भए, If \( 4,2 x-4, \ldots \ldots, 64,21 x+2 \) are the terms of geometric sequence (i) \( x \) को मान पत्ता लगाउनुहोस् । (Find the value of \( x \).) (ii) समान अनुपात पत्ता लगाउनुहोस् । (Find the common ratio.) (iii) चौथो पद पत्ता लगाउनुहोस् । (Find the value of fourth term.)

\( \left\{ \begin{array} { l } { ( x + y ) ^ { 2 } - ( x - 1 ) ^ { 2 } - ( y + 2 ) ^ { 2 } - 2 y ( 1 + x ) = 3 } \\ { x ( x ^ { 2 } - 1 ) + ( y - x ) ^ { 3 } - ( y - 1 ) ( y ^ { 2 } + y + 1 ) = 3 y - 3 x y ( y - x ) } \end{array} \right. \)

ExERCICE 3 Inéquation Résoudre dans \( \mathbb{R} \) les inéquations suivantes : \( \begin{array}{lll}\text { 1) } x^{2}+3 x-4 \leqslant 0 & \text { 2) } 7 x-3 \leqslant 2 x^{2} & \text { 3) } \frac{5 x^{2}-3 x}{x^{2}+4 x+3} \geqslant 0\end{array} \)

\( f(x)=\frac{\sqrt{x+2}}{3-3 x^{2}} \), for which values of \( x \) \( (x) \) non real

h) \( \left\{\begin{array}{l}x+y+z=50 \\ 2 x=y+1 \\ 2 x=5 z\end{array}\right. \)

95 If \( \frac{\log x}{\log 3}+\frac{\log x}{\log 9}+\frac{\log x}{\log 27}=22 \), then \( x=\ldots \ldots \ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) } 3^{2} & \text { (b) } 3^{9} & \text { (c) } 3^{12} & \text { (d) } 3^{27}\end{array} \)