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Montano1993 [528]
3 years ago
7

Four more than the square root of a number

Mathematics
1 answer:
Monica [59]3 years ago
5 0

Answer:

sqrt(4 + (3 x) ) = 7

4 + 3 x = 49

3 x = 45

x = 15

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What 2 numbers add to get 2 and multiply to 4
rusak2 [61]
Factor 4
4=1 times 4
2 times 2
they don't add to 2
set up equation
x+y=2
xy=4

first equation, subtract x from both sides
y=2-x
subsitute for y
x(2-x)=4
distribute
2x-x^2=4
add x^2
2x=x^2+4
subtract 2x
0=x^2-2x+4
use quadratic formula which is
if you have ax^2+bx+c=0 then
x=\frac{ -b+/-\sqrt{b^{2}-4ac} }{2a} so

1x^2-2x+4=0
a=1
b=-2
c=4
x=\frac{ -(-2)+/-\sqrt{(-2)^{2}-4(1)(4)} }{2(1)}
x=\frac{ 2+/-\sqrt{4-16} }{2}
x=\frac{ 2+/-\sqrt{-12} }{2}
we have \sqrt{-12} and that doesn't give a real solution
therefor there are no real solutions
but if you want to solve fully
x=\frac{ 2+/-2\sqrt{-3} }{2}
i=\sqrt{-1}
x=\frac{ 2+/-2i\sqrt{3} }{2}
x=1+/-i\sqrt{3}
x=1-i\sqrt{3} or x=1+i\sqrt{3} (those are the 2 numbers)

 





6 0
4 years ago
It is your birthday and you are going to get a new cell phone. The day you buy the phone, you will have to pay the $49 interest
Juli2301 [7.4K]

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30.46

Step-by-step explanation:

4 0
3 years ago
Mackenzie needed to get her computer fixed. She took it to the repair store. The technician at the store worked on the computer
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Answer:

x=65

Step-by-step explanation:

Based on the given conditions, formulate: 157+3.75 X x=400.75

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Answer:

( intransitive) To tend steadily upward or downward. ...

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( colloquial, usually followed by a preposition)

Step-by-step explanation:

5 0
3 years ago
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The next larger tenth is  76.1 .
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Neither of those is any closer to 76 than 76 is.

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