Embarassed to ask this but 0 = x2 – 15x + 50 ?

[viet_jon]

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

Homework Statement

0 = x2 – 15x + 50

Homework Equations

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...

 

[EnumaElish]

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

 

[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

 

[DaveC426913]

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

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

 

[rock.freak667]

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

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)

 

[viet_jon]

got it...thankx