Question

If `[{:(a+4,3b),(8,-6):}]=[{:(2a+2,b+2),(" "8,a-8b):}]`, then find the value of `(a-2b)`.

Answer 1

Comparing the corresponding elements of given equal matrices, we have `a+4=2a+2,3b=b+2` and `a-8b=-6.`
From these equations, we get `a=2` and `b=1.`
`:." "(a-2b)=(2-2xx1)=(2-2)=0.`