212k views
4 votes
The square of a number is 12 less than 7 times the number. what is the number

User Khanh Van
by
7.7k points

2 Answers

7 votes

Answer:

The answer is D: 3 or 4

I hope this helps! Have a good day!

User Rajat Gupta
by
8.0k points
1 vote
First lets write out the equation
7x - 12 = x^2
7x = x^2 + 12
x^2 - 7x + 12
then factor
(x-4)(x-3)
x= 4, 3
To check if we have any extraneous solutions we plug them back into our equation.
(4)^2 - 7(4) + 12 = 0
(3)^2 - 7(3) + 12 = 0

since they both equal 0, your answer is both 4 and 3
User Gofilord
by
7.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories