Substitute the given values of x=2, y=1 and z=-3 where applicable to find the value of the expression:
[tex]3x^2+4y^2[/tex]Taking the given values in consideration, then:
[tex]\begin{gathered} 3x^2+4y^2=3(2)^2+4(1)^2 \\ =3(4)+4(1) \\ =12+4 \\ =16 \end{gathered}[/tex]Therefore:
[tex]x=2\wedge y=1\wedge z=-3\Rightarrow3x^2+4y^2=16[/tex]Notice that the value of z was not used.
