alleryI is the 2×2 identity matrix. If A+I=[[3,-1],[4,6]], find A.
A[[4,-1],[4,7]]
B[[3,-2],[3,6]]
C[[2,-2],[3,5]]
D[[2,-1],[4,5]]
Answer & Solution
Correct answer: D. [[2,-1],[4,5]]
Subtracting I reduces the two diagonal entries by 1 and leaves the other entries unchanged.
Keep practising Algebra: Equations, Inequations & Matrices
Browse all Algebra: Equations, Inequations & Matrices questions for ICSE Class 10, or explore more Mathematics topics.
Related questions
The smallest natural number that satisfies x > 4 isA linear inequation in one variable can be written asSolve x + 3 > 5, then x belongs toSolve (2 x - 5) / 3 >= 1 over integers.Solve -2 (x - 3) <= 4. Then x belongs toSolve 2 x + 5 > 11, then x belongs toSolve (x + 2)/3 - (x - 1)/2 <= 1. Then x belongs toThe largest integer x satisfying 3 x - 4 < 2 x + 5 is