noah734934 noah734934

29-09-2020
Mathematics

contestada

The difference of the square of a number and 21 is equal to 4 times that number. Find
the negative solution.

Respuesta :

mathstudent55 mathstudent55

29-09-2020

Answer:

-3

Step-by-step explanation:

Let the number be x.

x^2 - 21 = 4x

x^2 - 4x - 21 = 0

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

x - 7 = 0 or x + 3 = 0

x = 7 or x = -3

Answer: -3

Answer Link

quacktheboy quacktheboy

03-05-2021

Answer:

-3

Step-by-step explanation:

I got it right

Answer Link

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