Tuesday

October 21, 2014

October 21, 2014

Posted by **sally** on Friday, January 13, 2012 at 6:29pm.

x^2-7x+10=0

(x-5)(x+2)= 0

x-5=0

x+5 +5 x=5

I was following this formula but got stumped on this question please help.

- integrated algebra -
**Damon**, Friday, January 13, 2012 at 6:31pmx (x-3) = 0

x = 0 or x = 3

- integrated algebra -
**sally**, Friday, January 13, 2012 at 6:57pmbefore looking at your answer i found the answer to be 0 too but like this:

x^2-3x=0

x^2-3x+0=0

(x-0)(x+0)=0

0^2-3(0)=0

was my way right

- integrated algebra -
**Damon**, Friday, January 13, 2012 at 7:10pmNo, because -0x-0x is not -3x

You missed the x = 3 root entirely.

Please do it my way :)

- integrated algebra -
**Damon**, Friday, January 13, 2012 at 7:15pmIf you insist on completing the square:

x^2 - 3x = 0

(-3/2)^2 = 9/4

so

x^2 - 3 x + 9/4 = 9/4

(x-3/2)^2 = 9/4 =3/2

x- 3/2 = +/- 3/2

x = 3/2 + 3/2 = 3

pr

x = 3/2 - 3/2 = 0

- integrated algebra -
**Damon**, Friday, January 13, 2012 at 7:18pmby the way

x^2-7x+10=0

(x-5)(x+2)= 0

x-5=0

x = 5

OR

x+2 = 0

x = -2

- integrated algebra -
**sally**, Friday, January 13, 2012 at 7:25pmdo i always have to mention the ors

- integrated algebra -
**Damon**, Friday, January 13, 2012 at 7:36pmIf it is a quadratic, in general it has two solutions, so you need to give both.

Sometimes, if the vertex of the parabola is exactly on the x axis, the two roots will be the same. For example:

x^2 -4x + 4 = 0

(x-2)(x-2) = 0

x = 2

or

x = 2

- integrated algebra -
**sally**, Friday, January 13, 2012 at 7:54pmoh, okay, thank you!

**Answer this Question**

**Related Questions**

algebra - how would i work out the following problems solve each formula in ...

Pre-Algebra - Please help to solve to find x,y 1. y=7x-3 2. 4x+2y=8 Take the ...

physics Classical Mechanics - Hi, Greco. I am using the following formula to ...

ALGEBRA - I have two problems that I am not sure about how to work out. 1. The ...

Algebra - I have two problems that I am not sure about how to work out. 1. The ...

Algebra - The formula T=2π√L/480 can be used to find the period (T in...

i need help..algebra/math - solve by using the quadratic formula: x2 plus x ...

Algebra - Solve by using the quadratic formula. 3x^2=11x+4. Look up the formula ...

math 213 - The effect of depreciation can be computed using a formula similar to...

algebra - use substitution to solve the linear system 3x+2y=-5 4x-3y=16 help plz...