Now we haveA=3x724So, A=3x×4-14Given that A=10⇒10=12x-14⇒24=12x⇒x=2Note:sinx+y=sinx cosy+cosx siny

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Now we have A = [\begin{matrix} 3 x & 7 \\ 2 & 4 \end{matrix}] So, |A| = 3 x \times 4 - 14 Given that |A| = 10 \Rightarrow 10 = 12 x - 14 \Rightarrow 24 = 12 x \Rightarrow x = 2 Note : \sin (x + y) = sinx cosy + cosx siny

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