Question

if x is equals to 2 Y is equals to - 3 and z is equals to - 2 find the value of 4xy power 2 - 3 y z power 2 + 4x power 2 z

Answer 1

$x = 2y = - 3 \\ x = - 3 \\ y = \frac{ - 3}{2} \\ z = - 2 \\ {4xy}^{2} - 3y {z}^{2} + 4 {x}^{2} z \\ = 4( - 3)( \frac{ - 3}{2} )( \frac{ - 3}{2}) - 3( \frac{ - 3}{2})( - 2)( - 2) + 4( - 3)( - 3)( - 2) \\ = - 27 + 18 - 72 \\ = 18 - 99 \\ = - 81$