divdiv365 divdiv365

02-09-2017
Mathematics

contestada

three times the square of a non-zero number is equal to fifteen times the number.. what is the number?

Respuesta :

wolf1728 wolf1728

02-09-2017

3 * (x^2) = 15x
3x^2 -15x = 0
x= - -15 +- sq root (225 -4*3*0) / 2*3
x = [15 +-sq root (225 -4*3*0] / 6
x1 = [15 +15] / 6
x1 = 5

x2 = [15 -15] / 6
x2 = 0

The number is 5

Check
3 * 5^2 = 15 * 5
75 = 75

Answer Link

Otras preguntas

4. A new spiral notebook contains 30 more sheets of paper than a new memo book. The total number of sheets of paper in 3 new spiral notebooks and 5 new memo boo

A photon with a frequency of 5.48 × 10^14 hertz is emitted when an electron in a mercury atom falls to a lower energy level. Calculate the energy of this photon

what does rumor Mean Cause I don't know what it means

0.278. what is his batting average rounded to the nearest hundredth

-(x-2)=11 Possible answers: -5 -9 5

Which element is a solid at STP? A. H2 B. I2 C. N2 D. O2

Darla copies her uncle's address and phone number into her contact list. His area code is 775. His ZIP code is 89507. Which statement about the value of the 5 i

in what way was maryland different from the other english colonies

Find the acceleration of a train whose speed increases from 7m/s to 17 m/s in 120s

Which of the following events was a primary factor in the outbreak of independence movements in Latin America? the Spanish War of Independence the Seven Years W