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OverLord2011 [107]
3 years ago
9

Sergey is solving 5x2 + 20x – 7 = 0. Which steps could he use to solve the quadratic equation by completing the square? Check al

l that apply. 5(x2 + 4x + 4) = –7 + 20 x + 2 = 5(x2 + 4x) = 7 5(x2 + 4x + 4) = 7 + 20 5(x2 + 4x) = –7 x + 2 =
Mathematics
2 answers:
Readme [11.4K]3 years ago
8 0

Answer:

5(x^2+4x)=7

Option 2 and 3 is correct.

Step-by-step explanation:

Case (I).

Given equation is

5x^2+20x-7=0

Firstly, we will add of 7 in both sides

5x^2+20x-7+7=7

Now, same variable of opposite sign is cancelled

5x^2+20x=7

Now, taking 5 common from left side

5(x^2+4x)=7

Case (II).

Given equation

5x^2+20x-7=0

Firstly, we will add of 7 in both sides

5x^2+20x=7

Now, we will add of 20 in both sides

5x^2+20x+20=7+20

Now, taking common of 5 from left side

5(x^2+4x+4)=7+20

So, The next step on solving completing square is 5(x^2+4x)=7 and 5(x^2+4x+4)=7+20

Dahasolnce [82]3 years ago
4 0

Answer:

2,3,4 are the answers on edge

Step-by-step explanation:

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Find the sum of 7a^3+14a+12 and -6a^3+12a^2-7
Rasek [7]

Answer:

a³+2a³+5

Step-by-step explanation:

7a³+14a+12+{-6a³}+12a²-7

=<u>7a³-6a³</u>+<u>14a+12a²</u>+<u>12-7</u>

=a³+2a³+5

4 0
3 years ago
Bella wants to save for a vacation in three years and this vacation costs $2300. She deposits $2000 into a bank earning 5% inter
ddd [48]

Answer:

$2,323.2

Step-by-step explanation:

A = P(1 + r/n)^nt

Where,

A = future value = ?

P = present value = 2,000

r = interest rate = 5% = 0.05

n = number of periods = 12

t = time = 3 years

A = P(1 + r/n)^nt

= 2,000(1 + 0.05/12)^12*3

= 2,000( 1 + 0.00417)^36

= 2,000( 1.00417)^36

= 2,000(1.1616)

= 2,323.2

A = $2,323.2

5 0
3 years ago
Adele opens an account with $100 and deposits $35 a month. Kent opens an account with $50 and also deposits $35 a month. Will th
Svetach [21]
Equations:

100 + 35m
50 + 35m

Steps:
100 + 35m = 50 + 35m <span>

<em>Set the equations equal to each other.</em>
</span>   <span />
<span>
100 + 35m = 50 + 35m <span>
-50              - 50
</span>
<em>Subtract 50 from both sides of equation to isolate the variable on one side</em>.

50+35m=35m
     -35m  -35m

<em>Subtract 35m from both sides of equation.</em>

50=m

In fifty months, they will have the same amount of money. They will each contain $1850 dollars.

Hope this helps.
</span>                      

7 0
3 years ago
2. Casey puts wrapping paper around a gift box. She wants to tie a ribbon
jok3333 [9.3K]
I would go with Bbbbb
6 0
3 years ago
Please help me with this question! Thank you in advance.
Vesnalui [34]

Answer:

Step-by-step explanation:

1. if the sub is at 325.8 at it was originally at 275 you have to put the numbers in absolute value. so 325.8 - 275=50.8

the sub went down -50.8 feet to get to 325.8

if the diver dives another 23 feet you have to put the numbers in absolute value and add 325.8 + 23= -348.8 feet underwater

on hour 3 it says that it descends an average of how much he went down in the first 2 hours witch is -73.8

i got -73.8 by adding hours one and two

then you add hour 3 by -348.8  

8 0
3 years ago
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