Find the value of the expression 2x – 3y + 4z, if x = 10, y = -12 and z = 11.

Given expression = 2x – 3y + 4z
If x = 10, y = -12 and z = 11,
The expression becomes, (2 × 10) (3 × -12) + (4 × 11)
= 20 – (-36) + 44
= 20 + 36 + 44
= 100.