A, b,c is m*m matrix. if symmetric, then tr(abc)=tr(acb). but this does not work if there are 4 symmetric matrix.
give a counter example in the case that there are four symmetric matrices

X= 49; x = 4step 1: foilstep 2: equal both to 0step 3: find x individually

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.