If x = 4, y = 2, and z = -1, evaluate: 2x2 + y – z

7

Explanation:

Replace the variable x with 4 in the expression.

2 x 2 + y - z

Replace the variable y with 2.

2 x 2 + 2 - z

Then, replace the variable z with -1.

2 x 2 + 2 - (-1)

Remove parentheses.

2 x 2 + 2 - (-1)

Simply each term.

Then, multiply 2 by 2

4 + 2 - (-1)

Multiply -1 by -1

4 + 2 + 1

Simplify by adding the numbers

( add 4 and 2)

6 + 1

Finally, add the 6 and the one

= 7

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