Thursday

January 29, 2015

January 29, 2015

Posted by **John** on Wednesday, April 23, 2008 at 9:49pm.

- Math -
**Damon**, Wednesday, April 23, 2008 at 9:56pmx^2 - 14 x + 13 = 30 y

x^2 - 14 x = 30 y - 13

x^2 - 14 x + 49 = 30 y + 36

(x-7)^2 = 30 y + 36

x - 7 = +/- sqrt (30 y + 36)

x = 7 +/- sqrt (30 y + 36)

- Math -
**Damon**, Wednesday, April 23, 2008 at 10:02pmThis is so much harder than your other question that I suspect a typo by the way.

- Math -
**John**, Wednesday, April 23, 2008 at 10:05pmx^2 - 14 x + 13 = 30 y

x^2 - 14 x = 30 y - 13

x^2 - 14 x + 49 = 30 y + 36 ****

(x-7)^2 = 30 y + 36

x - 7 = +/- sqrt (30 y + 36)

x = 7 +/- sqrt (30 y + 36)

where did you get the 49 or 36

- Math -
**Damon**, Wednesday, April 23, 2008 at 10:10pmCompleting the square

x^2 + a x = something

x^2 + a x + (a/2)^2 = something + (a/2)^2

so

if

x^2 -14 x = something

then

x^2 - 14 x +(14/2)^2 = something + (14/2)^2

or

x^2 - 14 x + 49 = something + 49

(x-7)^2 = something + 49

x - 7 = +/- sqrt (something + 49)

by taking half the second coefficient and squaring it, I get a perfect square.

- Math -
**Damon**, Wednesday, April 23, 2008 at 10:13pmand 49 - 13 = 36

- Math -
**JOHN**, Wednesday, April 23, 2008 at 10:24pmwhy is this not correct

30y = x^2 - 14x + 13

- 13

30y - 13 = x^2 - 14x

_________ ___________

-14 -14

x = sqrt 30y-13

_______

-14

Im really trying to follow your work... This is what I got the first time I tried before i asked...

- Math -
**JOHN**, Wednesday, April 23, 2008 at 10:28pmsorry the division signs didn't line up correctly

- Math -

**Answer this Question**

**Related Questions**

Math - why is this not correct 30y = x^2 - 14x + 13 - 13 30y - 13 = x^2 - 14x ...

Math - 30y = x^2 - 14x + 13 FOR X

algebra - solve the following equation by clearing fractions show all work want ...

MATH ALGEBRA - Which of the following coordinates are intercepts of the linear ...

algebra - solve the following equation by clearing fraction want to know if this...

math - which equation is equivalent to 5x-2(7x+1)=14x? why? a -9x-2=14x b -9xt1=...

Algebra2 - The area of a square garden in square feet is 49x^2-14x+1. Find the ...

Maths - find the equation of the perpendicular bisector of the line joining P(2...

Math - Derivatives - Differentiate the given function. Simplify the answer. f(x...

algebra - How do you simplify (4x^3y^5)^2? are you using the carrots for ...