Salirrosasnicol
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 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

What is the remainder when (x4 + 36) is divided by (x2 – 8)? 36
thx for ur helpness click the picture
An apple drops from a tree and hits the ground in 1.4s how far does it fall?
Which city is the centrally located capital of Turkey?
Which individual would be the safest from a lightening strike? a. a person standing 8 miles away b. a person on a bike 8 miles away c. a person in a tent 8 mil
You are the network administrator for a school system. Your boss informs you that she is thinking of implementing a BYOD program. She asks you if there are any
Can a 13 Year old be diagnosed with Schizotypal personality disorder?
The sun’s pole reversals are tied to its
Complemetary angles are two angles whose measures add up to 90 degrees. The ratio of the measures of two complementary angles is 2:13. What are the measures of
can someone help with this question