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Brums [2.3K]
3 years ago
6

Solve x^2 − 4x = 14.

Mathematics
1 answer:
DENIUS [597]3 years ago
3 0
Minus 14 from both sides
x²-4x-14=0
use quadratic formula because we cant factor

for
ax²+bx+c=0
x= \frac{-b+/- \sqrt{b^2-4ac} }{2a}

so
1x²-4x-14=0
a=1
b=-4
c=-14

x= \frac{-(-4)+/- \sqrt{(-4)^2-4(1)(-14)} }{2(1)}
x= \frac{4+/- \sqrt{16+56} }{2}
x= \frac{4+/- \sqrt{72} }{2}
x= \frac{4+/- 6\sqrt{2} }{2}
x= 2+/- 3\sqrt{2}

the solutions are
x=2+√3 and
x=2-√3
You might be interested in
The sum of squares of two consecutive positive even integers is 52 more than their product. Find these numbers.
natulia [17]

Answer:

The first set of consecutive even integers equals (8 , 6)

The second set is ( - 8 and - 6) which also works.

Step-by-step explanation:

Equation

(x)^2 + (x + 2)^2 = (x)(x + 2) + 52            Remove the brackets on both sides

Solution

x^2 + x^2 + 4x + 4 = x^2 + 2x + 52        Collect the like terms on the left

2x^2+ 4x+ 4 = x^2 + 2x + 52                  Subtract right side from left

2x^2 - x^2 + 4x - 2x + 4 - 52  =  0          Collect the like terms

x^2 + 2x - 48 = 0                                     Factor

(x + 8)(x - 6) = 0

Answer

Try the one you know works.

x - 6 = 0

x = 6

Therefore the two integers are 6 and 8

6^2 + 8^2 = 100

6*8 + 52  = 100

So 6 and 8 is one set of  consecutive even numbers that works.    

========================

What about the other set.

x + 8 = 0

x = - 8

x and x + 2

- 8  and -8 + 2 = - 8, - 6

(- 8 )^2 + (- 6)^2 = 100

(-8)(-6) + 52 = 100

Both sets of consecutive numbers work.


5 0
3 years ago
Read 2 more answers
St=18 and s = -4 where could T be located ?
Veseljchak [2.6K]

Answer:

14 or -22

Step-by-step explanation:

st=18

s=-4

-4+18=14

so t can be  at 14

or -4-18=-22

t can be at -22

3 0
2 years ago
In a group of 20 students, 5 of them wear
il63 [147K]

Answer:

15 of them do not wear glasses

Step-by-step explanation:

20-5=15

Hope this helps. Have a great day :)

8 0
2 years ago
What is the sum of 8 and 10?
Pachacha [2.7K]

Answer:

18

Step-by-step explanation:

pls mark brainliest

idk if this is a joke

3 0
3 years ago
What amount will an account have after 2 years if $2950 is invested at an annual rate of 8.4% compounded quarterly? Also, determ
ankoles [38]

The amount if $2950 is invested at an annual rate of 8.4% compounded quarterly is $3486

<h3>Compound interest</h3>

Compound interest is given by:

A=P(1 + \frac{r}{n} )^{nt}

where t is the period, r is the rate, P is the initial amount, A is the final amount and n is the times compounded.

Given P = 2950, r = 0.084, n = 4, t = 2, hence:

A=2950(1+\frac{0.084}{4} )^{4*2}\\\\A=\$3486\\\\For \ r=0.078, A=3742,t=2,n=1:\\\\3742=P(1+\frac{0.078}{1} )^{1*2}\\\\P=\$3220

The amount if $2950 is invested at an annual rate of 8.4% compounded quarterly is $3486

Find out more on Compound interest at: brainly.com/question/24924853

3 0
2 years ago
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