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Delvig [45]
3 years ago
12

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

Mathematics
2 answers:
Alex_Xolod [135]3 years ago
5 0

Answer:

21

Step-by-step explanation:

2x² - x

2(-3)² - (-3)

2(9) + 3

18 + 3

21

V125BC [204]3 years ago
4 0

Answer:

21

Step-by-step 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

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Answer:

The replicas will have a surface area of 3 m2, 2.4 m2 and 2 m2 respectively.

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