2 years ago

What is 4x(5x-2)=20x-2

Mathematics

1 answer:

Zanzabum2 years ago

7 0

Answer: x = 1.32 and x= 0.076

Step-by-step explanation:

4x(5x-2) = 20x-2

20x^2-8x = 20x-2

20x^2-8x-20x+2=0

20x^2-28x+2=0

Using quadratic equation

x = (-b +or- √(b^2-4ac))/2a

a =20, b=28, c= 2

Substitute into the equation

x= (7+√39)/10. = 1.32

x = (7-√39)/10 = 0.076

You might be interested in

If sine ⁡theta equals negative 8/17 and the terminal side of theta lies in quadrant IV, find cosine ⁡ theta .

Lelechka [254]

$\sin^2\theta+\cos^2\theta=1\implies \cos\theta=\pm\sqrt{1-\sin^2\theta}$

Since $\sin\theta=-\dfrac8{17}$ , it follows that

$\cos\theta=\pm\sqrt{1-\dfrac{64}{289}}=\pm\sqrt{\dfrac{225}{289}}=\pm\dfrac{15}{17}$

where the sign depends on the location of the terminal side of the angle. Since the terminal side lies in the fourth quadrant, that means the cosine of the angle is positive, so

$\cos\theta=\dfrac{15}{17}$

3 0

3 years ago

Find the fourth term the geometric sequence whose 2nd term is 8 and whose common ratio is 4

pickupchik [31]

Answer:

solution

given that

ar=8 __________equation 1

r=4

putting r=4in equation 1 we get

a×4=8

a=2

now

t4=ar^(4-1)

= 2×4^3

=2×4×4×4

=128ans

3 0

3 years ago

A principal of 750$ is invested in an account at 9% per year simple interest. What is the account total after 5 years

balandron [24]

Hi there
The formula of the future value of simple interest is
A=p (1+rt)
A future value?
P principle 750
R interest rate 0.09
T time 5years
So
A=750×(1+0.09×5)
A=1,087.5

Good luck!

4 0

2 years ago

What is the equation of the hyperbola ?

ryzh [129]

Jdksksh jwwohhśke wanak can up819

8 0

2 years ago

The equation 3/x=5/7 is equivalent to the equation

katrin2010 [14]

Answer:

Step-by-step explanation:

3/x=5/7 is the same as A 21=5x Both equal to 21/5 or 4 1/5

7 0

2 years ago