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ozzi
2 years ago
15

2x2 + 2x - 1 when x = -3

Mathematics
2 answers:
myrzilka [38]2 years ago
4 0
2x2+2x-1=
4+2(-3)-1=
4+(-6)-1=
4+(-7)=
-3
Elina [12.6K]2 years ago
4 0

Answer: 11

Concept:

Here, we need to understand the idea of evaluation.  

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

<u>Given information</u>

x = -3

<u>Given expression</u>

2x² + 2x - 1

<u>Substitute values into the expression</u>

=2(-3)² + 2(-3) - 1

<u>Simplify exponents</u>

=2(9) + 2(-3) - 1

<u>Simplify by multiplication</u>

=18 - 6 - 1

<u>Simplify by subtraction</u>

=12 - 1

=\boxed{11}

Hope this helps!! :)

Please let me know if you have any questions

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One golfer's scores for the season are 88, 90, 86, 89, 96, and 85. Another
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Mean of the first golfer = 89

Mean of the second golfer = 87

Range of the first golfer = 11

Range of the second golfer = 8

Explanation:

First golfer scores 88, 90, 86, 89, 96 and 85.

Sum of the scores of first golfer = 88 + 90 + 86 + 89 + 96 + 85 = 534

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\text {Mean} = \frac{\text {Sum of the observation}}{\text {Number of observation}}

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Range of the first golfer = Highest score – Lowest score

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Sum of the scores of second golfer = 91 + 86 + 88 + 84 + 90 + 83 = 522

Number of observation of second golfer = 6

\text {Mean} = \frac{\text {Sum of the observation}}{\text {Number of observation}}

Mean of the second golfer = \frac{522}{6}=87

Mean of the second golfer = 87

Range of the second golfer = Highest score – Lowest score

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Range of the second golfer = 8

Comparing the golfer's skills:

Mean of first golfer is greater than Mean of second golfer.  (i.e. 89 > 87)

Range of first golfer is greater than Range of second golfer. (i.e. 11 > 8)

Thus, first golfer have more skills than second golfer.

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Step-by-step explanation:

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