Question

Assume that A and B are matrices of the same size. Determine an expression for A if 2A − B = 5(A + 2B)

Answer 1

Given expression is-

$2A-B=5(A+2B) \\[9pt] 2A-B=5A+10B \\[9pt] 3A=-11B \\[9pt] A=\dfrac{-11}{3}B$