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

Find the simplest form of the general term for the sequence 11, 15, 19, 23, .

What caused African Americans to be treated like slaves under President Johnson's plan for Reconstruction? A.The Confederate army B.The Runaway Slave Act C.

what is an example of genre

What were some of the problems that city residents faced in the late 1800s and early 1900s?

In time-out, adam, a disruptive child who wants to stay with his class, is removed from the classroom. this exemplifies:

Mr. smith had a fever of unknown origin. when the doctors completed an echocardiogram and saw vegetations on his mitral valve, they suspected:

Which theorem proves that the triangles are congruent? A) ASA B) SAS C) SSA D) SSS

Please do 12, 13, and 14! Please show work so I can understand! Thank you!

What was the "porfiriato"? a. a period in mexican history marked by the dictatorship of porfirio diaz and his wide spread corruption b. a period in mexican hist

A neonate's __________ reflex involves an automatic response to a stroke to the chin, a touch on the cheek, or an object placed at the lips.