What is 2x+23-x=8+4x-6?

30 points!<br><br><br> The solutions to the equation: 2x2 + x-1 = 2 are x=-3/2 or X=___

frez [133]

Answer: A quadratic equation is one of the form ax2 + bx + c = 0, where a, b, and c are numbers, and a is not equal to 0. So I think x = 4 but not 100%

Sorry if I'm wrong but I hope this helps

3 0

3 years ago

Help on 3 algebra questions please !!!***

madam [21]

Answer:

19) The domain is (12 , ∞) ⇒ answer C

17) The radical notation is $\sqrt[7]{18y^{2} }$

10) The definition of number i is √(-1) ⇒ answer C

Step-by-step explanation:

19)

* Lets explain the meaning of the domain of the function

- The domain of any function is the values of x which makes the

function defined

- Examples:

# In the fraction the denominator con not be zero, then if the function

is a rational fraction then the domain is all the values of x except

the values whose make the denominator = 0

# In the even roots we can not put negative numbers under the radical

because there is no even roots for the negative number belonges to

the real numbers, then the domain is all the values of x except the

values whose make the quantity under the radical negative

* Now lets solve the question

∵ f(x) = 3 √(x - 12)

- To find the domain let (x - 12) greater than zero because there is

no square root for negative value

∵ x - 12 > 0 ⇒ add 12 to both sides

∴ x ≥ 12

∴ The domain is all values of x greater than 12

* The domain is (12 , ∞)

17)

* Lets talk about the radical notation

- The radical notation for the fraction power is:

the denominator of the power will be the radical and the numerator

of the power will be the power of the base

- Ex: $x^{\frac{a}{b}}=\sqrt[b]{x^{a}}$

* Lets solve the problem

∵ (18 y²)^(1/7)

- The power 1/7 will be the radical over (18 y²)

∴ $(18y^{2})^{\frac{1}{7}}=\sqrt[7]{18y^{2}}$

* The radical notation is $\sqrt[7]{18y^{2} }$

10)

* Lets talk about the imaginary number

- Because there is no even root for negative number, the imaginary

numbers founded to solve this problem

- It is a complex number that can be written as a real number multiplied

by the imaginary unit i, which is defined by i = √(-1) or i² = -1

- Ex: √(-5) = √[-1 × 5] = i√5

* The definition of number i is √(-1)

3 0

3 years ago

A store manager asks every 25th person to enter the store which sales they like the best. Which type of data collection method i

Makovka662 [10]

Answer:

D. None of the choices are correct.

Step-by-step explanation:

Systematic sampling refers to a method of random sampling during which sample members are extracted from a larger population and then collecting corresponding observations using a constant interval between samples taken. This interval, called the sampling interval, is measured by deducting the size of the population by the required sample size. As per the question, the store manager asks every 25th person about the sales which is a classic example of systematic sampling.

4 0

2 years ago

Find the limit (enter 'DNE' if the limit does not exist)

vaieri [72.5K]

Answer:

$\lim\limits_{(x,y)\rightarrow(0,0)}\left(\sqrt{-2x^2-6y^2+1}+1\right)=2$

Step-by-step explanation:

We need to first simplify the expression using rationalization(i.e. if a square root term exists in the denominator, then multiply and divide the whole expression by the denominator(but the change the sign of its middle term))

here, we need to find:

$\lim\limits_{(x,y)\rightarrow(0,0)}\left(\dfrac{-2x^2-6y^2}{\sqrt{-2x^2-6y^2+1}-1}\right)$