Question

Evaluate the expression xy-4z when x= 5, y=-4, and z=-2

A) -12
B) -28
C) 8
D) 20

Answer 1

To evaluate the expression xy-4z with given variable values, substitute into the expression and calculate. The resulting value with x=5, y=-4, and z=-2 is -12, which is option A.

Step-by-step explanation:

To evaluate the expression xy-4z when x=5, y=-4, and z=-2, you would follow these steps:

1. Substitute the given values into the expression: (5)(-4) - 4(-2).
2. Multiply x and y: 5*-4 = -20.
3. Multiply -4 and z: -4*-2 = 8.
4. Add the results of step 2 and step 3: -20 + 8 = -12.

So, the value of the expression xy-4z is -12, which corresponds to option A.