By raising the expression -3x^3y^4 to four and applying the properties of exponents we get:
[tex](-3x^3y^4)^4=(-3)^4(x^3)^4(y^4)^4=(-3)^4(x^{})^{4\times3}(y^{})^{4\times4}=81x^{12}y^{16}[/tex]Then, the expression -3x^3y^4 is equivalent to 81x^12y16
