Question

3x squared + 4 y squared if x equal to 2 y equal 1 and Z equal -3

Answer 1

Substitute the given values of x=2, y=1 and z=-3 where applicable to find the value of the expression:

`3x^2+4y^2`

Taking the given values in consideration, then:

`\begin{gathered} 3x^2+4y^2=3(2)^2+4(1)^2 \\ =3(4)+4(1) \\ =12+4 \\ =16 \end{gathered}`

Therefore:

`x=2\wedge y=1\wedge z=-3\Rightarrow3x^2+4y^2=16`

Notice that the value of z was not used.