Answer :

understand pemdas
parenthasees
exponenets
multiiplication or dividsion
additon or subtraction


(4x)^2=4x times 4x
4x^2=4 times x times x=4(x^2)

(4x)^2=16x^2
4x^2=4(x^2)
values are not equal
(just for fun: 4x^2=(2x)^2)