SOLUTION: I just can not remember how to set this problem up.

SOLUTION: I just can not remember how to set this problem up.

Algebra.Com

Question 148681:
I just can not remember how to set this problem up.

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
A number is 20 less that its square. Find all such numbers.
.
Let x = a number(s)
.
x = x^2 - 20
0 = x^2 -x - 20
Factoring we get:
0 = (x-5)(x+4)
.
Solution: x = {5, -4}

RELATED QUESTIONS
I am trying to solve a percent proportion. I am not sure how to set up the problem when... (answered by josgarithmetic)

I am a homeschooling mom and i can not remember how to set up this problem to teach my... (answered by checkley71)

I need help to learn how to set up equations so that I can solve it; Because I am having... (answered by rfer)

There are exactly four times as many submarines as there are aircraft. Which of the... (answered by stanbon,Alan3354,Earlsdon)

HELP PLEASE! I for some reason can not understand how to figure out this problem. It (answered by Alan3354)

I can't remember how to set this one up. Can I get a step-by-step? Find the following... (answered by jim_thompson5910)

if a pharmacist has 20L of a 10% drug solution. How many liters of 5$ solution must be... (answered by stanbon)

I cannot figure out how to set this problem up, can you help... (answered by ccstarburstlover)

CAN YOU PLEASE HELP ME WITH THIS PROBLEM, THE LINE MEANS DEVIDE I JUST COULD NOT FIND A... (answered by Alan3354)