The square of a number decreased by 4 times the number equals 21. Find the number.

asked Nov 20, 2020 37.4k views

1 vote

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4 votes

Answer: 7

Step-by-step 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****

Umutambyi Gad answered Nov 24, 2020

5.4k points

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