Find the value of x, from the following: `|(x,4),(2,2x)|=0`

Find the value of x from the following: |x4 2 2x|=0

Find the value of x, from the following: det[[x,42,2x]]=0

Find the value of x in the following (2^3)^4=(2^2)^x

find the values of x, y,z from the following matrix equation : 2[{:(x,y),(z,o):}]=[{:(x,6),(2,0):}]+[{:(4,x+y),(x,0):}]

find the values of x, y,z from the following matrix equation : 2[{:(x,y),(z,o):}]=[{:(x,6),(2,0):}]+[{:(4,x+y),(x,0):}]

Find the values of the following polynomials: p(x) = 2x^(2) + (1)/(4)x + 13 , when x = -1