Question

Evaluate the expression 2x^2 - x, when x = -3. Show all steps.

Answer 1

21

Explanation:

2x² - x

2(-3)² - (-3)

2(9) + 3

18 + 3

21

Answer 2

21

Explanation:

This is a substitution question,we are to substitute a given value in place of a certain letter

So let's solve

2x^2-x

And since x is given to be -3

So let's substitute

2(-3)^2-(-3)

2(9)-(-3)

18+3

21

So the final answer is 21