Question

If x=3 and y=-2 and z=4, what is the value of 3x + 2y - z?

Answer 1

$3x+2y-z=3\cdot3+2\cdot(-2)-4=9-4-4=1$

Answer 2

3x3=9     -2x2=-4     4-0=4

9+-4-4

ANS. = 1