Which expression is equivalent to ^4sqrt 6/^3 sqrt 2

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work

Find the measure of angle b in the following triangle