solve the problem quickly

Let A be 8x8 matrix : [[ 91 91 91 91 91 91 91 91] [ 126 106 71 25 -25 -71-106 -126] [ 118 49 -49 -118 -118 -49 49 118] [ 106 -25 -126 -71 71 126 25-106] [ 91 -91 -91 91 91 -91 -91 91] [ 71-126 25 106 -106 -25 126 -71] [ 49 -118 118 -49 -49 118 -118 49] [ 25 -71 106 -126 126 -106 71 -25]] let X be 8x8 matrix which each element value in range of -128..127 Question 1: What is the possible highest(max) and lowest(min) element value for X2? where : X2 = A*X Question 2: What is the possible highest(max) and lowest(min) element value for X3? where : X3 = A*X*Transpose(A)