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

Which syllable is emphasized when pronouncing the word hypotonia?

PLEASE SOMEONE HELP ME I REALLY NEED IT!!! ASAP PLEASE !!!!!

PLEASE HELP!!!!Which of the following options is an equivalent function to f(x)=3(2)3x

Yolanda has an ownership interest in many different companies, yet she owns the shares of stock of just one organization. yolanda undoubtedly owns shares in a(n

The results of the end of the Cold War included ____. Choose all that apply.A. the end of the Soviet UnionB. the end of communismC. independence for the Sovi

Describe the immigrants that did not come willingly to the united states?

The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for Pi)?

When obtaining a drug history from harold, he gives you a complete list of his prescription medications. he denies taking any other drugs, but you find that he

help someone plz A student needs to make a rectangular cardboard piece that is 12 inches long. The area of the cardboard piece should be between 60 square inch

How does the industrial rivalry affect britain's relationship with germany?