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pshichka [43]
2 years ago
8

Rewrite the function by completing the square. f(x)=x^2+x-30 It’s supposed to look like this f(x)= (x+ )^2+ .

Mathematics
1 answer:
leonid [27]2 years ago
3 0

Answer:

f(x)=(x+1/2)^2 +(- 30.25)

Step-by-step explanation:

In this question we are required to rewrite the given function by using completing the square method.

Completing the square method requires that our given equation can be written in form: (a\pm b)^2 = a^2 \pm 2ab +b^2

SO, we have to transform our equation according to above format.

Since our equation is x^2+x-30, we will transform it into

(a + b)^2 = a^2 + 2ab +b^2

because the middle term of given equation has + sign.

x^2+x-30=0\\x^2+x=30\\x^2 + 2(x)(1/2) + (1/2) ^2 = 30 + (1/2)^2

We have introduced (1/2)^2 on both sides of the equation to gain the required form.

(x+1/2)^2 = 30.25\\(x+1/2)^2 - 30.25 = 0\\f(x) = (x+1/2)^2 +(- 30.25)

Our answer is f(x)=(x+1/2)^2 +(- 30.25)

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irga5000 [103]

Answer:

The interval that represents the middle 68% of her commute times is between 33.5 and 42.5 minutes.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

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Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 38 minutes, standard deviation of 4.5 minutes.

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Within 1 standard deviation of the mean. So

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38 + 4.5 = 42.5 minutes.

The interval that represents the middle 68% of her commute times is between 33.5 and 42.5 minutes.

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Answer:

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Step-by-step explanation:

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Hope this helps.

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The area of a circle is 77.28m2.<br> Find the length of the diameter rounded to 1 DP.
allochka39001 [22]

Answer:diameter=9.92m

Step-by-step explanation:

Area=77.28

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77.28/3.14=(3.14x(d/2)^2)/3.14

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