The vector matrix [2/7] is dilated by a favor of 1.5 and then reflected across the x axis. if the resulting matrix is [a/b] then a= and b=

a = 3 and b = -10.5

Step-by-step explanation:

We have the vector

First, this vector is dilated by a factor of 1.5

So, the new vector is,

i.e.

i.e.

Further, this vector is reflected across the x-axis.

So, the resulting vector is

Thus, the value of 'a' and 'b' are 3 and -10.5 respectively.

the answer is -81 is the answer