AP EAMCET · Maths · Matrices
If \(A=\left[\begin{array}{ccc}1 & -2 & 2 \\ 2 & -6 & 5 \\ 5 & 0 & 4\end{array}\right]\), then \(\operatorname{Adj} A=\)
- A \(\left[\begin{array}{ccc}-24 & 8 & 2 \\ 17 & -6 & -1 \\ 30 & -10 & 2\end{array}\right]\)
- B \(\left[\begin{array}{ccc}-24 & 8 & 2 \\ 17 & -6 & 1 \\ -30 & 10 & -2\end{array}\right]\)
- C \(\left[\begin{array}{ccc}-24 & 8 & 2 \\ 17 & -6 & -1 \\ 30 & -10 & -2\end{array}\right]\)
- D \(\left[\begin{array}{ccc}24 & -8 & 2 \\ -17 & -6 & 1 \\ 30 & -10 & -2\end{array}\right]\)
Answer & Solution
Correct Answer
(C) \(\left[\begin{array}{ccc}-24 & 8 & 2 \\ 17 & -6 & -1 \\ 30 & -10 & -2\end{array}\right]\)
Step-by-step Solution
Detailed explanation
\[ \begin{aligned} A & =\left[\begin{array}{ccc} 1 & -2 & 2 \\ 2 & -6 & 5 \\ 5 & 0 & 4 \end{array}\right] \\ |A| & =1(-24)+2(8-25)+2(0+30) \\ & =-24-34+60=2 \end{aligned} \] Cofactor matrix of…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Maths
- If \(z\) is complex number such that \(\left|z-\frac{4}{z}\right|=2\), then the greatest value of \(|z|\) isAP EAMCET 2012 Medium
- The slope of the tangent at any point \((x, y)\) on the curve, is equal to the product of the coordinates of that point. If the equation of the normal to the curve at the point \((\sqrt{2}, e)\) is \(a x+b y=1\), then \(\frac{b}{a}=\)AP EAMCET 2023 Easy
- Let \(A\) and \(B\) be events in a sample space \(S\) such that \(P(A)=0.5, \quad P(B)=0.4\) and \(P(A \cup B)=0.6\). Observe the following lists.
The correct match of List I from List II is
(i) (ii) (iii) (iv)AP EAMCET 2011 Medium - \(\int_{\frac{-\pi}{2}}^{\frac{\pi}{2}} \log \left(\frac{2-\sin \theta}{2+\sin \theta}\right) d \theta\) is equal toAP EAMCET 2004 Medium
- The variance of 20 observations is 5 . If each one of the observations is multiplied by 2 , then the variance of the resulting observations isAP EAMCET 2023 Medium
- If a complex number \(z\) satisfies
\(|z|^2+1=\mid z^2-1\), then the locus of \(z\) isAP EAMCET 2018 Easy
More PYQs from AP EAMCET
- Which of the following represents a parabola?AP EAMCET 2022 Easy
- A small disc is on the top of a smooth hemisphere of radius ' R '. The smallest horizontal velocity ' \(V\) ' that should be imparted to the disc so that disc leaves the hemisphere surface without sliding down is (there is no friction)AP EAMCET 2024 Medium
- If each line of a pair of lines passing through origin is at a perpendicular distance of 4 units from the point \((3,4)\), then the equation of the pair of lines isAP EAMCET 2019 Easy
- When the temperature of moles of an ideal gas is increased by at constant pressure, find the work involved in the process.AP EAMCET 2021 Easy
- Let \(z=x+i y\) and a point \(P\) represent \(z\) in the Argand plane. If the real part of \(\frac{z-1}{z+i}\) is 1 , then a point that lies on the locus of \(P\) isAP EAMCET 2018 Easy
- An electron beam travels with a velocity of \(1.6 \times 10^7 \mathrm{~ms}^{-1}\) perpendicularly to magnetic field of intensity \(0.1 \mathrm{~T}\). The radius of the path of the electron beam \(\left(m_e=9 \times 10^{-31} \mathrm{~kg}\right.\) )AP EAMCET 2007 Easy