# Homework Help: Embarassed to ask this but 0 = x2 – 15x + 50 ?

1. Nov 19, 2007

### viet_jon

[SOLVED] embarassed to ask this...but 0 = x2 – 15x + 50 ??

1. The problem statement, all variables and given/known data

0 = x2 – 15x + 50

2. Relevant equations

3. The attempt at a solution

line1 0 = x2 – 15x + 50
line2 0 = (x – 5)(x – 10)

question: how does the equation in line one work out to the equation in the second line?
reviewing my algebra...i can't believe how much high school math I forgot...

2. Nov 19, 2007

### EnumaElish

x(x - 10) - 5(x - 10)

3. Nov 19, 2007

### DaveC426913

What is your question? You're factoring a binomial.

So, (x+a)(x+b)=0 factors to x*x + a*x + b*x + a*b = 0

4. Nov 19, 2007

### DaveC426913

Isn't this
x^2 - 5x + 90
?

5. Nov 19, 2007

### rock.freak667

x(x - 10) - 5(x - 10)

no no it isnt

if you factor out (x-10 from above...you will get (x-10)(x-5)

6. Nov 19, 2007

### viet_jon

got it.......thankx

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook