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Norma-Jean [14]
3 years ago
7

(x+7)(2x+1)=7 solve by using quadratic formula

Mathematics
1 answer:
Olenka [21]3 years ago
8 0
I believe it is x= 7, -2
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Carlos is using the quadratic formula to find the solutions of y=3x^2-5x-2. Which of the following will simplify to the correct
Nana76 [90]

Answer:

Fx=\frac{5\pm\sqrt{25+24} }{6}

Step-by-step explanation:

A quadratic equation in one variable given by the general expression:

ax^2+bx+c

Where:

a\neq 0

The roots of this equation can be found using the quadratic formula, which is given by:

x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}

So:

y(x)=3x^2-5x-2=0

As you can see, in this case:

a=3\\b=-5\\c=-2

Using the quadratic formula:

x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}=\frac{-(-5)\pm\sqrt{(-5)^2-4(3)(-2)} }{2(3)}=\frac{5\pm\sqrt{25+24} }{6}

Therefore, the answer is:

Fx=\frac{5\pm\sqrt{25+24} }{6}

4 0
3 years ago
What is the slope formula of (4,2) and (7, 6.5)
Lady_Fox [76]

Suppose the given coordinates are represented as,

\begin{gathered} (x_1,y_1)=(4,2) \\ (x_2,y_2)=(7,6.5) \end{gathered}

Then, the formula for slope can be expressed as,

\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ m=\frac{6.5-2}{7-4} \end{gathered}

Solving it,

m=\frac{4.5}{3}=1.5

The slope is 1.5.

The formula of (10, 8) anjd (-5,8) is

m=\frac{8-8}{-5-10}

3 0
1 year ago
The manager of a grocery store selected a random sample of 100 customers to estimate the average checkout time. The 90% confiden
lina2011 [118]

Answer:

c

Step-by-step explanation:

3 0
3 years ago
For an exponential regression equation in the form y=ab^x which of the following values of b will cause y to get smaller as x ge
sdas [7]

Answer:

d) 0.798

Step-by-step explanation:

Since we know that an exponential function is in form: y=a*b^x, where,

a= Initial value,

b = For growth b is in form (1+r), where r is rate in decimal form.

b = For decay or regression b is less than 1 and in form (1-r), where r is rate in decimal form.

Upon looking at our given choices we can see that options a, b and c are in form 1+r, while choice provided in option d is less than 1 and in form 1-r, therefore, option d is the correct choice.

 

5 0
3 years ago
Read 2 more answers
I need help pleaseeeeeeee
Alekssandra [29.7K]

Answer:

T = 7M/N

Step-by-step explanation:

Cross multiply

NT = 7M

Divide by N

NT/N = 7M/N

T = 7M/N

3 0
3 years ago
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