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

A car starts from rest and accelerates at 2.0 m/s2 for 10 seconds. What is the car's displacement at the end of 10 seconds?

What is the volume of a pyramid 4 cm,4 cm by 12 cm

Is Fitness physical or mental and emotional ?

Eric and Francine were at the library. They had a big report due in school, and they wanted to get as much research done as possible. Neither one of them was pa

What role do bacteria ply in the nitrogen cycle

27. A fluid's resistance to flow is called A. temperature B. density C. viscosity D. mass E. heat

Tonya’s dog-walking service charges a flat rate of $20 per month, plus $3 per mile that each dog is walked. Beth does not charge a monthly fee for her dog-walki

Three is a zero of the equation x^3−4x^2−3x+18=0. Which factored form is equivalent to the equation?

###3. Which of the following does the excerpt most clearly suyyesi about Lincoln's plan for ending the war and reuniting the nation? A. Lincoln's intent was to

[tex]( - 8)( - 2.2) = [/tex]