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3 years ago

Solve. x² + 6x + 9 = 12 (Choices in photo)

Mathematics

2 answers:

Irina18 [472]3 years ago

6 0

X^2 + 6x + 9 = 12

X^2 + 6x - 3 = 0

(-6 ± <span>√(6^2 - 4*1*-3) ) / 2

3 </span>± √(48) / 2<span>

</span>3 ± 4√(3) / 2

3 ± 2√(3)

jeyben [28]3 years ago

6 0

To solve this problem and to calculate the value of the variable "x", you must apply the following proccedure:

1. You have the quadratic equation:
<span>
x²+6x+9=12

2. Then:

</span>x²+6x+9-12=0
x²+6x-3=0
<span>
3. You must apply the quadratic formula, which is:

(-b±√(b^2-4ac))/2a

a=1
b=6
c=-3

4. Then, the result is:

x=-3</span>±2√3
<span>
Therefore, the correct option is the first one: </span>x=-3±2√3

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Determine if 0.949449444944449444449 rational or irrational and give a reason for answer.

Kamila [148]

Answer:

irrational if it's more after this number but if it stops at the last 9 then it's a rational number

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Step-by-step explanation:

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2 years ago

I need to know the answer

Elena L [17]

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Answer:

D. 105 ft²

Step-by-step explanation:

The total surface area is the sum of the base area and the triangular face areas.

Area of base:

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A = (7 ft)² = 49 ft²

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2 years ago

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Sry can't answer your question but I'll keep trying to figure it out :(

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3 years ago

X - (6.9) = 42.8<br><br> x = 42.8 +

Harman [31]

I hope this helps you

x=42.8+6.9

x=49.7

4 0

2 years ago

Read 2 more answers

The reaction time (in seconds) to a certain stimulus is a continuous random variable with pdf f(x) 5 5 3 2 ? 1 x2 1

muminat

The probability that the reaction time for this density function is at most 2.5 seconds is equal to 0.9.

<h3>What is a density function?</h3>

A density function can be defined as a type of function which is used to represent the density of a continuous random variable that lies within a specific range.

<h3>How to calculate the probability that reaction time is at most 2.5 seconds?</h3>

P(X ≤ 2.5) = Fx(2.5)

Fx(2.5) = 3/2 - 3/2(2.5)

Fx(2.5) = 3/2 - 3/5

Fx(2.5) = 0.9.

Read more on density function here: brainly.com/question/14448717

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Complete Question:

The reaction time (in seconds) to a certain stimulus is a continuous random variable with pdf:

f(x) = $\left \{ {{\frac{3}{2x^2} \;1 \leq x\leq 3} \atop {0}\;otherwise} \right$

What is the probability that reaction time is at most 2.5 seconds?

7 0

1 year ago