Salirrosasnicol Salirrosasnicol

02-05-2019
Mathematics

contestada

The square of a number decreased by 4 times the number equals 21. Find the number.

Respuesta :

sprinkles1222 sprinkles1222

02-05-2019

Answer: 7

Explanation:

x^2-4x=21

x^2-4x-21=0

(x+3)(x-7)=0

x=-3

x=7

*** if you need to find the positive # only, the ANSWER is 7****

Answer Link

Otras preguntas

During photosynthesis, plants take in light energy from the Sun, carbon dioxide from the air, and water through their roots. Which of the following is a product

What does this translate to? 그러자 별종이 말했다.

affix definition of tri

The portion of the vascular plant that has the majority of the methods of asexual reproduction occurring in it is the _____. root stem leaf tuber

write 7/10 as a sum of fractions two different ways

What is the proper economic term for money that is available for investment?

Weather and climate are different because _____. weather is less predictable while climate is predictable weather changes have a global impact while climate cha

The greater the mass is in an object, the higher resistance to a change in movement the object will have. true or false

Constantinople's name was changed to Tehran/Byzantine/lstanbul/Baghdad after the Ottomans defeated it in 1453.

A tire with a radius of 22 centimeters