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3 years ago

Solve x2 + 2x + 1 = 17 for x.

Mathematics

2 answers:

KonstantinChe [14]3 years ago

7 0

X=−1+√17 or x=−1−√17 is the answer.

Jobisdone [24]3 years ago

5 0

First get the equation to equal 0 by subtracting 17 from both sides.
You should have x^2+2x-16=0
Next plug your numbers into the quadratic formula(-b^2+/- the square root of b^2-4ac -all divided by 2a)
The end result should be x=-1+/- the square root of 17 or(if you want the decimal) 3.12310562, -5.12310562

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3 years ago

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3 years ago

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AlekseyPX

Answer:

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(b) There are 12 values in the data set which are greater than or equal to 30 and less than or equal to 39.

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Step-by-step explanation:

We are given a set of data that is summarized by the stem and leaf plot below;

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This shows that the data values are: 10, 10, 12, 14, 14, 14, 17, 18, 18, 18, 18, 19, 22, 22, 25, 25, 27, 28, 33, 34, 34, 35, 35, 35, 36, 36, 36, 37, 39, 39, 43, 43, 43, 45, 45, 47, 49.

(a) From the data above, the number of values in the data set which are greater than or equal to 10 and less than or equal to 19 is 12, i.e; 10, 10, 12, 14, 14, 14, 17, 18, 18, 18, 18, 19.

(b) From the data above, the number of values in the data set which are greater than or equal to 30 and less than or equal to 39 is 12, i.e; 33, 34, 34, 35, 35, 35, 36, 36, 36, 37, 39, 39.

(c) From the data above, the number of values in the data set which are greater than or equal to 40 and less than or equal to 49 is 7, i.e; 43, 43, 43, 45, 45, 47, 49.

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3 years ago