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3 years ago

ASAP HELP PLEASE GIVING BRAINLIEST! Please read the question THEN answer correctly! No guessing!!

Mathematics

1 answer:

Marta_Voda [28]3 years ago

4 0

Answer:

C x = (-5+sqrt(-3))/2

D x = ( -5-sqrt(-3))/2

Step-by-step explanation:

Set the polynomial equal to zero

x^2 + 5x+7 =0

Subtract 7 from each side

x^2 + 5x+7-7 =-7

x^2 + 5x = -7

Complete the square by taking the coefficient of x and dividing by 2 and then squaring it

(5/2)^2 = 25/4

x^2 + 5x + 25/4 = -7+25/4

(x+5/2)^2 = -28/4 +25/4

(x+5/2)^2 = -3/4

Take the square root of each side

x+5/2 = ±sqrt(-3/4)

Subtract 5/2 from each side

x+5/2 -5/2 = -5/2±sqrt(-3/4)

x = -5/2±sqrt(-3/4)

x = -5/2±sqrt(-3)/2

x = (-5±sqrt(-3))/2

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Elisa withdrew $20 at a time from hermano account and withdrew a total of $140. Francis withdrew $45 at a time from his bank acc

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Elisa withdrew $20 to equal $140 if you divide 140/20 is how much times she withdrew was a total of 7. While the same with with Francis except his total was almost 7 with it being 6.75

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3 years ago

Five times the difference between a number and four is greater than the quotient of four times the number and six. Find the smal

JulijaS [17]

$x-\ number\\\\\
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30(x-4)>4x\\\\
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26x>120\ \ \ | divide\ by\ 26\\\\
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3 years ago

Read 2 more answers

The circumference of a circle with an area of 1,809.56 square centimeters

Virty [35]

$\bf \textit{area of a circle}\\\\
A=\pi r^2~~
\begin{cases}
r=radius\\
------\\
A=1809.56
\end{cases}\implies 1809.56=\pi r^2
\\\\\\
\cfrac{1809.56}{\pi }=r^2\implies \boxed{\sqrt{\cfrac{1809.56}{\pi }}=r}\\\\
-------------------------------\\\\
\textit{circumference of a circle}\\\\
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3 years ago

here are the first five terms of a quadratic sequence (1 8, 21, 40, 65). the nth term of this sequence can be written in the for

bazaltina [42]

Answer:

a=3 and b=-2

Step-by-step explanation:

We are given that five terms of a quadratic sequence are

1 8, 21, 40, 65.

The nth term of this sequence

= $an^2+bn$

We have to find the value of a and b where a and b are integers.

For n=1

$a+b=1$ ......(1)

For n=2

$(2)^2a+2b=8$

$4a+2b=8$

$2a+b=4$ .....(2)

Subtract equation (1) from (2) we get

$2a-a=4-1=3$

$a=3$

Using the value of a=3 in equation (1)

$3+b=1$

$b=1-3=-2$

Hence, the value of

a=3 and b=-2

5 0

3 years ago

SECUL

dmitriy555 [2]

Answer:
he bought 5 english books and 5 math books

explanation:
total spent on english books 5x22=110
total spent on math books 5x29=145
total spent together: $255

4 0

3 years ago